muscle fibers contain cylindrical structures called myofibrils, which are composed of Skeletal- Gross Anatomy
What materials make up myofibrils?The thin and thick myofilaments that make up the myofibrils are what give it muscle the striped appearance.Along with 2 other muscle regulating proteins, tropomyosin and troponin, the thick filaments are made up of strands of the protein myosin, while the thin filaments are made up of strands of the protein actin.
A muscle fiber is made up of what three components?The layer or connective tissue known as the perimysium surrounds each bundle or muscle fibers, in which fasciculi are referred to.The fasciculus' endomysium, a connective tissue, surrounds each muscle fiber fiber or muscle cell.
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it is now possible to have your personal dna sequenced and analyzed. in addition to ancestry research ,people often use this information to make decisions regarding their health.some say we can now predict which potential health concerns a person may face in their life.is this an accurate prediction?
Some saying we can now predict the potential health concerns a person may face in their life is referred to as an accurate prediction.
What is DNA?This is referred to as deoxyribonucleic acid and it is the genetic material of living organisms which is responsible for the passing of traits from the parent to the offspring. it also comprises of chromosomes which are involved in cell division during reproduction.
DNA sequencing and analysis has led to organisms or individuals predicting the potential health concerns they may face in their life because it is hereditary in some cases.
For example an individual whose parents or ancestors have a history of diabetes or high blood pressure then the offspring will most likely have iut too which is how it is an accurate prediction.
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In gene expression in eukaryotes, the primary transcript is transported unchanged directly to the cytoplasm and is ready for translation.
a. True
b. False
It is false that In gene expression in eukaryotes, the primary transcript is transported unchanged directly to the cytoplasm and is ready for translation.
Before being transferred to the cytoplasm, the primary transcript goes through a number of processing steps in the nucleus following transcription. These handling steps incorporate the expulsion of introns (non-coding groupings), the expansion of a poly-A tail to the 3' finish of the record, and the expansion of a 5' cap to the 5' finish of the record. The mRNA molecule cannot function properly or remain stable without these modifications.
The mRNA molecule is transported to the cytoplasm only after these processing steps are finished, where ribosomes can turn it into a protein. Therefore, the assertion that the primary transcript is ready for translation and is transported unchanged directly to the cytoplasm is false.
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how many dna molecules would there be after four rounds of pcr if the initial reaction mixture contained two molecules?
32 molecules of DNA would be after four PCR if the initial reaction mixture contained two molecules.
After 'n' rounds of the polymerase chain reaction, it is feasible to produce 2 n DNA molecules from a single DNA template molecule (PCR). Therefore, 2 to the power 4 = 16 DNA molecules will be produced after 4 PCR cycles If two molecules are doubled four times, 32 DNA molecules are created.The PCR method is what?
The highly sensitive PCR method enables quick DNA amplification of a particular section. Using visual methods based on size and charge, PCR may detect and identify gene sequences by producing billions of copies of a certain DNA fragment or gene.
What does a PCR have to accomplish?
A given DNA segment can be quickly multiplied (amplified) into millions or billions of copies using the polymerase chain reaction (abbreviated PCR), allowing for more in-depth analysis.
What are the three main PCR steps?
For any DNA synthesis reaction, there are only three easy stages that must be completed: First, the template is denaturated into single strands. Next, primers are annealed to each original strand to synthesise new DNA strands. Finally, the new DNA strands are extended from the primers.
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what does the term digestion
Answer: Digestion is the process by which the body breaks down food into smaller molecules that can be absorbed and used for energy. This process begins in the mouth, where food is mechanically broken down by chewing and mixed with enzymes that begin to break down the food chemically. The partially digested food then moves through the esophagus and into the stomach, where it is mixed with stomach acid and further broken down into a liquid called chyme.
From the stomach, the chyme moves into the small intestine, where it is mixed with enzymes from the pancreas and bile from the liver. These enzymes continue the process of breaking down the food into its individual molecules, such as sugars, amino acids, and fatty acids. These molecules are then absorbed into the bloodstream through the walls of the small intestine and transported to the liver, where they are processed and used for energy.
Digestion is a complex and essential process that allows the body to extract the nutrients it needs from the food we eat. It involves both mechanical and chemical processes, and is aided by a number of organs and enzymes in the digestive system.
true or false? achondroplasia, one of the most important genetically determined diseases of the skeletal system, is characterized by the formation of very thin and delicate bones that are easily broken under minimal stress.
Answer: Flase
Explanation: this is false because achondroplasia is not mined towards the disease of the skeleton disease.
most communication between the peripheral nervous system and the central nervous system takes place via __________ that enter and exit the spinal cord.
Most communication between the peripheral nervous system and the central nervous system takes place via Nerves that enter and exit the spinal cord.
Communication between the Peripheral and Central Nervous SystemsNerves are the pathways through which information is transmitted between the peripheral and central nervous systems. They enter and exit the spinal cord, providing a direct connection between the two systems.
The spinal cord serves as the gateway for the nervous system to relay information between the body and the brain. Nerves are the pathways for this information, traveling along the spinal cord to the brain to be processed. Nerves enter and exit the spinal cord, providing direct connections between the peripheral nervous system, which responds to signals from the body, and the central nervous system, which controls and coordinates the body’s functions.
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The citric acid cycle is a stage of catabolism that oxidizes acetate into carbon dioxide and generates energy. There are eight enzymes involved in the citric acid cycle.
Which enzymes produce NADH as a product? Select all that apply.
The enzymes that produce NADH as a product are alpha-ketoglutarate dehydrogenase, malate dehydrogenase, and isocitrate dehydrogenase.
Catabolism is that the set of metabolic pathways that breaks down molecules into smaller units that are either alter to unleash energy or employed in alternative anabolic reactions. biological process breaks down giant molecules into smaller units.
Enzymes are proteins that act as biological catalysts by fast chemical reactions. The molecules upon that enzymes might act are known as substrates, and also the accelerator converts the substrates into totally different molecules called product. Enzymes perform the crucial task of lowering a reaction's activation energy—that is, the number of energy that has to be place certain the reaction to start.
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within human populations, it is unethical to force people to mate with each other in order to map disease genes. how do scientists go about determining where the disease genes are located?
Knowing which genes—when they are dysfunctional—cause which diseases will make it easier to diagnose patients and give information on the functional traits of the mutation.
With the development of modern high-throughput sequencing methods and the knowledge gained from the expanding area of genomics, illness genes are being identified more quickly, enabling researchers to find more complex mutations. Techniques for identifying disease genes frequently use the same general process. First, DNA is taken from a number of patients who are thought to share a hereditary condition. Their DNA samples are then examined and screened to identify likely areas where the mutation may exist. The following list includes these methods. The mutant gene should be located in the region that overlaps when these likely locations are lined up next to one another. Candidate genes are looked for in a region of the genome where sufficient sequence information is available. These genes' coding areas are then sequenced up until a mutation is found or another patient is identified, at which point the research can be repeated, potentially focusing on a smaller region of interest.
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many fireflies have flash patterns unique to their species and use them to identify other members of their species. this is an example of
Many fireflies have distinctive flash patterns that they utilize to recognize other fireflies in their species. In this case, behavioral isolation is being used.
A behavior is considered isolated when it prevents reproduction from taking place. As one illustration, male fireflies use particular light patterns to entice females. The way that various species exhibit their lights vary; if a male of one species attempted to attract a female of another, she would not be able to recognize the male’s light pattern and would not mate with him.
When a species becomes reproductively separated from others due to behavioral differences, this is referred to as behavioral isolation. Natural selection uses behavioral isolation to stop species from reproducing with one another. Two different species developing to survive in different ecological niches or two species having various forms of mating rituals, such as dance and auditory signals, are only two examples of conditions that might result in behavioral isolation. These variations are what is referred to as prezygotic barriers or reproductive hurdles that help advance evolution.
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Question: Signals from the _____ make the skeletal muscles move.
Pls help it’s due tomorrow
Answer:
Brain
Explanation:
According to Le Chatelier’s principle, what happens to the equilibrium constant (K) when the concentration of the reactants is doubled?
The value of the equilibrium constant (K) is doubled.
The value of the equilibrium constant (K) is halved.
The value of the equilibrium constant (K) remains the same.
The value of the equilibrium constant (K) changes unpredictably.
According to Le Chatelier’s principle, the value of the equilibrium constant (K) remains the same when the concentration of the reactants is doubled.
What do you mean by equilibrium constant?For a chemical reaction, the equilibrium constant can be defined as the ratio between the amount of reactant and the amount of product which is used to determine chemical behaviour.
For an equilibrium equation aA + bB ⇌ cC + dD, the equilibrium constant (K), can be given by the formula,
K = [C]c[D]d / [A]a[B]b
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Answer:
c
Explanation:
edge 2023
digoxin is an inhibitor of na /k atpase that is used to treat irregular heartbeats (medical term: atrial fibrillation). digoxin slows the heartbeat by raising intracellular calcium levels. what is the most reasonable explanation for how digoxin can raise intracellular calcium concentrations through inhibiting na /k atpase?
A lower-than-normal intracellular Na+ concentration is the outcome of inhibiting Na+/K+ ATPase. The Na+/Ca2+ ant porter's efficiency is lowered as a result.
By the Na +/ K +- ATPase quizlet, which of the following are pumped?To make up for the continual leaking of sodium and potassium ions, the Na+-K+ pump actively transfers both ions across the membrane. Each ion is pushed in a specific direction. K+ is injected into the cell while Na+ is pushed out. which two ions' concentrations are highest outside of the cell.
What mechanism best describes Ca2+ removal from the cytosol?What mechanism best describes the transport of Ca2+ from the cytosol, where it is present in low concentrations, to the endoplasmic reticulum, where it is present in high concentrations? Active transport is required for calcium movement.
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which factors contributed to the great extinctions at the end of the permian, triassic, and cretaceous era? select 3 correct answers.
The Permian, Triassic, and cretaceous extinction events were caused by asteroid impacts, volcanic eruptions, and greenhouse gases.
Until recently, scientists have disagreed on what caused Earth's greenhouse gases waters to become so uninhabitable to life that 96% of marine species disappeared at the end of the Permian epoch. According to recent studies, global warming rendered ocean species unable to breathe, which led to the "Great Dying." Permian Major modifications to the greenhouse gases on Earth, extinctions such as those caused by enormous volcanoes that erupted in igneous Permian provinces and covered hundreds of thousands of square miles in lava, appear to be the main cause of mass extinctions.
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molecules that are similar enough to a neurotransmitter to bind to its receptor sites on a dendrite and block that neurotransmitter's effects are called
An antagonist is a molecule that is sufficiently similar to a neurotransmitter to bind to the receptor sites on a dendrite and inhibit the effects of that neurotransmitter.
Similar substances known as norepinephrine and epinephrine function in the body as hormones and neurotransmitters, respectively. Both chemicals are crucial to the body's fight-or-flight response, and when they enter the bloodstream, they raise blood pressure, heart rate, and blood sugar levels.
The synapse is the location where the dendrites of one neuron meet the axon of another neuron. named receptors by neuron. Like keys in locks, the neurotransmitters fit into the receptors.
Small amine molecules, amino acids, or neuropeptides make up the majority of neurotransmitters.
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which internal structures of animals are specifically adapted to use contraction to cause movement?
Muscle cells are the structures of animals are specifically adapted to use contraction to cause movement.
Muscle cells are designed to contract. Muscles enable motions such as walking, as well as bodily processes such as respiration and digestion. Muscle tissue is classified into three types in the body: skeletal muscle, cardiac muscle, and smooth muscle. Skeletal muscle tissue develops into skeletal muscles, which attach to bones or skin and control locomotion and any consciously controlled movement.
Skeletal muscle is also known as voluntary muscle because it can be controlled by thought. Skeletal muscles are long and cylindrical in shape; when examined under a microscope, skeletal muscle tissue appears striped or striated. To stay alive, grow, and reproduce, an animal must find food, water, and oxygen, as well as eliminate metabolic waste.
Therefore, muscle cells are the structures of animals are specifically adapted to use contraction to cause movement.
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you have stumbled on a new species of fly (order diptera), and being a geneticist, you have already identified a few genes and observed an unusual phenotypic inheritance pattern. you have noticed that some flies have wings pointing forward and other flies have wings pointing backward. digging in a bit deeper, you discover that the gene wing direction (wdir) controls which direction the wings point, and that if you cross a homozygous backward-wing mother (wdir wdir) with a homozygous forward-wing father (wdir- wdir-), all of the offspring (wdir wdir-) have backward wings. when you perform the reciprocal cross, a homozygous forward-wing mother (wdir- wdir-) with a homozygous backward-wing father (wdir wdir), you observe that all of the offspring (wdir wdir-) have forward-facing wings. how would you account for this bizarre genotype:phenotype relationship?
Explanation:
Only the maternal gene for wing direction is being expressed due to genomic imprinting that silences the paternal gene during gamete formation.
sometimes an enzyme is activated by a receptor and brings about the cellular response by generating a second messenger. such an enzyme is called .
Sometimes an enzyme is activated by a receptor and brings about the cellular response by generating a second messenger. Such an enzyme is called a(n) effector.
An effector molecule in biochemistry is often a tiny molecule that binds specifically to a protein and controls its biological activity. In this way, effector molecules function as ligands that can alter the expression of genes, the activity of enzymes, or cell signalling. Some mRNA molecules' activity can also be directly regulated by effector molecules (riboswitches). Hormone signalling and immunological response are two further instances of effector actions in biochemistry. Some proteins play the same function as effector molecules (small molecules are chemical compounds that are comparable in size to amino acids or RNA strands). As a result, the majority of effector molecules are significantly smaller than individual proteins, which include many amino acids. Cellular signal transduction cascades provide as one illustration of this. Other branches of biology employ the term effector. For instance, the endpoint at which an axon contacts the muscle or organ that it stimulates or suppresses is known as the effector end of a neuron.
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Which of the following taxonomic rank contain organisms most similar to one another? a. genius b. family c. species d. class
Species is the taxonomic rank contains organisms most similar to one another. The correct option to this question is C.
The least important group of options is species. Common characteristics of organisms increase as we move from a higher taxonomic rank of classification, like class, to a lower one, like species.
Different related species are included in each genus, family of related genus, order of related families, and class of related orders.
The species taxonomy classifies biological entities into groups based on the traits they share. These classifications, known as taxa (plural taxon), are placed according to taxonomic rank, where the more specific the grouping traits are the further down the tree you are.
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a. brainstem ventilation area b. brainstem rhythmicity area c. medullary ventilation area d. medullary rhythmicity area
As the dorsal group receives impulses from the vagus and glossopharyngeal nerves as well as from peripheral chemoreceptors and is in charge of producing inspiratory motions, the medullary respiratory center serves as the primary center for inspiration.
Three primary groups—two in the medulla and one in the pons—make up the respiratory center. The ventral respiratory group and the dorsal respiratory group are the two groups in the medulla. The pneumatic center and the apneustic center are the two components of the pontine respiratory group in the pons. The medulla oblongata's respiratory center regulates breathing on a minute-by-minute basis. Respiratory rhythm is not produced by a homogeneous population of pacemaker cells like the cardiac system.
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scientists look at thousands of mutagenized flies, one at a time, under a microscope. they are looking for flies that don't look like they have developed normally. they find a remarkable fly with an extra thorax and a complete extra set of wings. this is an example of:
That's an example of forward genetic screen. Forward genetics is used to analyze the genetic basis of a disease.
Forward genetics refers to a molecular genetics that is use to determine the genetic basis responsible for a phenotype. Forward genetics gives an unbiased approach because it relies heavily on identifying the genes or genetic factors that make a single phenotype or trait of interest. Forward genetics analyzes the genetic basis of a disease. Forward genetics offers a method to obtain objective information regarding a mutation's connection to a disease. Forward genetics is used to requires no prior knowledge about the gene being studied.
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if the passage of fluid is blocked at the confluence of sinuses, into which sinuses will fluid back up? (check all that apply.)
If the passage of fluid is blocked at the confluence of sinuses, into which sinuses will fluid back up fine capillaries.
The term "sinuses" refers to an enlargement or inflammation of the sinus tissue. The skull has four pairs of sinuses, which are cavities or gaps. They are linked by tiny canals. A thin mucus produced by the sinuses is expelled through the nasal passages. This drainage aids in keeping the nose germ-free and clean. Although they are usually filled with air, sinuses can clog and fill with fluid. A illness might develop after the emergence of germs (bacterial sinusitis). Rhinosinusitis is another name for this condition, where "rhino" stands for "nose." If the sinus tissue is inflamed, the nasal tissue will almost always swell. The paranasal sinuses in your head are close to your eyes and nose. They are so called because they are supported by skeletons. The ethmoidal sinuses are located between your eyes. The maxillary sinuses are located below your eyes. The sphenoidal sinuses are located behind your eyes. The frontal sinuses are located above your eyes. The largest of the sinus cavities, the maxillary cavity, is also one of the most prone to infection.
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what kinds of cells engulf whatever foreign cells and molecules they encounter and recognize?
Numerous cell-surface receptors on neutrophils and macrophages allow them to identify and absorb pathogens.
What is a pathogen ?
An organism that infects its host with disease is referred to as a pathogen, and the severity of the disease symptoms is referred to as virulence. Pathogens include viruses, bacteria, unicellular and multicellular eukaryotes, as well as other taxonomically diverse organisms.
Phagocytes, a type of living cell, devour or engulf other cells or particles through a process known as phagocytosis. An amoeba or other free-living single cell could make up the phagocyte, or it could be one of the body's cells like a white blood cell. The antigens, which are proteins on the surface of the pathogen, help the immune system identify invaders. Every substance or cell has a unique set of antigens, and every person's cells include "self-antigens" that are particular to that person.
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Which of these animal taxa has the highest population of species threatened with extinction?a) Birdsb) Mammalsc) Amphibians
Correct option is C. Amphibians
Any organism that is capable of live both on land and in water. particularly : any of a category of bloodless-blooded vertebrate animals (as frogs and salamanders) that in many respects are between fishes and reptiles. : an plane designed to take off from and land on both land or water.
Crocodiles can't be categorized as amphibians for the following reasons: Amphibians have the capability to breathe over land thru lungs and underwater through their pores and skin. Crocodiles breathe best the usage of lungs and whilst underwater, they need to often floor to respire.
Reptiles have scales, and their pores and skin is dry. Amphibians do not, and their pores and skin is regularly moist with mucus, which keeps them from drying up.
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An animal taxa has the highest population of species threatened with extinction The option c) Amphibians is the animal taxa has the highest population of species threatened with extinction.
Amphibians are 4-limbed and ectothermic vertebrates of the class Amphibia. They inhabit a huge sort of habitats, with maximum species living within terrestrial, fossorial, arboreal, or freshwater aquatic ecosystems.
This animal's elegance consists of toads and frogs, salamanders and newts, and caecilians. Almost all amphibians have thin, wet skin that enables them to breathe. No other institution of animals has this special skin. Most amphibians go through a completely unique alternate from larvae to adults, known as metamorphosis.
Amphibians have adapted to live in lots of different sorts of habitats. They may be observed in forests, woodlots, meadows, springs, streams, rivers, lakes, ponds, bogs, and marshes.
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some rna viruses have a gene encoding reverse transcriptase, some others have a gene encoding rna dependent rna polymerase. what can you conclude about these viruses?
Some RNA viruses have a gene encoding reverse transcriptase, some others have a gene encoding RNA dependent RNA polymerase. what can genomic RNA dependent viruses.
A polymeric molecule called ribonucleic acid (RNA) is crucial for many biological processes, including the coding, decoding, control, and expression of genes. Nucleic acids include RNA and deoxyribonucleic acid (DNA). Nucleic acids are one of the four primary macromolecules required for all known forms of life, along with lipids, proteins, and carbohydrates. Contrary to DNA, RNA is found in nature as a single strand folded over itself rather than a paired double strand. RNA is constructed as a chain of nucleotides, just like DNA. Using the nitrogenous bases guanine, uracil, adenine, and cytosine, represented by the letters G, U, A, and C, messenger RNA (mRNA) is used by cellular organisms to transmit genetic information that instructs the creation of particular proteins. Many viruses employ RNA to encrypt their genetic information. By regulating gene expression, catalyzing biological processes, or monitoring and relaying responses to cellular inputs, some RNA molecules actively participate in cellular processes. Protein synthesis, an ubiquitous function in which RNA molecules control the production of proteins on ribosomes, is one of these ongoing processes. Transfer RNA (tRNA) molecules are used in this process to transport amino acids to the ribosome, where ribosomal RNA (rRNA) joins amino acids to generate coded proteins.
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which letter represents the specific system that causes the skin to turn red after taking a very warm shower or sitting in a jacuzzi?
letter C represents the specific system that causes the skin to turn red after taking a very warm shower or sitting in a jacuzzi.
The blood vessels directly below the skin enlarge and fill with more blood, resulting in flushed skin. Flushing happens occasionally for most people and can be brought on by being too hot, exercising, or having strong emotions. Alcohol use and some drugs can both cause flushed skin as a side effect.
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What is the relationship between translation and meaning?
The relationship between translation and meaning is that both convey the explanation aspect.
An accurate definition of a sentence's or a text's meaning that conveys the same context or idea in a different language is referred to as a translation. Finding an equivalent meaning for a text in a second language is the goal of translation. Since meaning is the subject to be translated from the text in the source language into the text in the target language, then a strong focus on meaning equivalence.
The relationship between translation and meaning is a complex one. Translate is converting a message from one language into another, while meaning is the concept or idea that a word, phrase, or text expresses. For a translation to be successful, it must accurately convey the meaning of the original text. This can be challenging, as the same word can have different meanings in different contexts, and a single word in one language can often have no direct equivalent in another language.
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what is the effect of acetylcholine in the digestive system? a. increase production of secretions b. relaxation of sphincters c. contraction of smooth muscle in gi wall d. all of the listed answers are effects of acetylcholine.
Increase production of secretions, relaxation of sphincters, contraction of smooth muscle in gi wall are all effects of acetylcholine. Thus correct option(d).
Acetylcholine (ACh) is an organic molecule that serves as a neurotransmitter in the bodies and brains of several animal species, including humans.
It is an ester of acetic acid and choline, which is how its name was formed from its chemical composition. Cholinergic refers to bodily regions that utilize or are impacted by acetylcholine.
Cholinergics and anticholinergics are terms used to describe substances that alter the cholinergic system's overall function.
Why is acetylcholine necessary and what does it do?
The parasympathetic nervous system, a portion of the autonomic nervous system (a branch of the peripheral nervous system), which contracts smooth muscles, widens blood vessels, increases body secretions, and decreases heart rate, uses acetylcholine as its primary neurotransmitter.
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if a chemical that disrupts cell division were added to a test tube containing human kidney cells, which process would stop?
If a chemical that disrupts cell division were added to a test tube containing human kidney cells, mitosis process would stop.
Normal cells undergo the cell cycle in a controlled manner. They select whether to divide their cells based on information about their internal states as well as stimuli from their surroundings. This control prevents cells from dividing in unfavorable situations (such as when their DNA is damaged or when there is insufficient space in a tissue or organ for new cells).
A cell's fundamental decision point, or the point at which it must decide whether or not to split, is the G1. Once the cell enters the S phase and passes the G1, it is irrevocably committed to dividing. That is, a cell that successfully passes the G1 will go the rest of the way through the cell cycle and give rise to two daughter cells, barring unforeseen issues like DNA damage or replication failures.
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choose all the cranial nerves that parasympathetic fibers leave the brainstem through.
The cranial nerves through which the parasympathetic fibers leave the brainstem are oculomotor, facial, glossopharyngeal, and vagus nerves.
What is cranial nerves?Cranial nerves (CN) are those nerves that are made up of 12 pairs of nerves that connect the brain to different parts of the head, neck, and trunk.
The cranial nerves include the following:
olfactory (CN I), optic (CN II), oculomotor (CN III), trochlear (CN IV), trigeminal (CN V), abducent (or abducens; CN VI), facial (CN VII), vestibulocochlear (CN VIII), glossopharyngeal (CN IX), vagus (CN X), accessory (CN XI), and hypoglossal (CN XII).Of all the listed cranial nerves, the ones that leave the brainstem are
Oculomotor: This is the cranial nerve that helps to adjust and coordinate eye position during movement.
facial nerve: This is the cranial nerve that carries nerve fibers that control facial movement and expression.
Glossopharyngeal nerve: This is the cranial nerve that provides motor innervation to the stylopharyngeus muscle, which is responsible for elevating the pharynx and larynx.
Vagus nerves: This is the cranial nerve that controls specific body functions such as your digestion, heart rate and immune system.
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which are ways in which the parasympathetic and sympathetic division of the autonomic nervous system are similar?
Both nervous system divisions use a preganglionic and ganglionic neuron, both divisions have the autonomic ganglia that house the ganglionic neurons, and both divisions are controlled involuntarily.
Involuntary physiological activities including heart rate, blood pressure, breathing, digestion, and sexual arousal are regulated by the autonomic nervous system, a part of the peripheral nervous system. Sympathetic, parasympathetic, and enteric are its three physically separate divisions.
Both afferent and efferent fibers are present in the sympathetic nervous system (SNS) and parasympathetic nervous system (PNS).
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