Changes in gene expression in prokaryotes are tightly linked to changes in the environment. For that reason almost all of the changes are fully reversible, depending on environmental conditions.
Due to the lack of a defined nucleus, prokaryotic gene expression (both transcription and translation) occurs within the cytoplasm of a cell; thus, the DNA is freely located within the cytoplasm. Gene expression is a highly regulated process. It allows for cellular differentiation in multicellular organisms; in single-celled organisms such as prokaryotes, it primarily ensures that a cell's resources are not wasted making proteins that the cell does not require at the time.
Only by controlling the amount of transcription can prokaryotic cells regulate gene expression. The complexity of controlling gene expression increased as eukaryotic cells evolved. For example, the evolution of eukaryotic cells resulted in the compartmentalization of important cellular components and processes.
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he paranasal sinuses: a. act as resonant chambers for sound. b. are lined with mucosa continuous with the nasal cavity. c. help lighten the weight of the skull bones. d. are lined with mucosa continuous with the nasal cavity, help lighten the weight of the skull bones, and acts as a resonant chamber for sound.
He paranasal sinuses (d) are lined with mucosa continuous with the nasal cavity, help lighten the weight of the skull bones, and acts as a resonant chamber for sound.
Paranasal sinuses are a group of four paired air-filled spaces that surround the nasal cavity. The maxillary sinuses are located under the eyes; the frontal sinuses are above the eyes; the ethmoidal sinuses are between the eyes and the sphenoidal sinuses are behind the eyes.
They are centered on the nasal cavity and have various functions, including lightening the weight of the head, humidifying and heating inhaled air, increasing the resonance of speech, and serving as a crumple zone to protect vital structures in the event of facial trauma.
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parent 1 is heterozygous for both the ""a"" and the ""b"" alleles. parent 2 is homozygous recessive for the ""a"" allele and homozygous dominant for the ""b"" allele. what are the possible gametes each parent can produce in regards to these two traits?
If each mother and father are heterozygous (Ww), and homozygous there's a 50% hazard that any person in their offspring can have a gametes each parent can produce in regards to these two traits.
A Punnett rectangular may be used to decide all viable genotypic combos withinside the mother and father. A pedigree that depicts a dominantly inherited trait has some key distinctions.The Punnett rectangular underneath makes it clean that at every birth, there might be a 25% hazard of you having a everyday homozygous (AA) baby, a 50% hazard of a wholesome heterozygous (Aa) service baby such as you and your mate, and a 25% hazard of a homozygous recessive (aa) baby who possibly will finally die from this.
The opportunity that each heterozygous mother and father will make a contribution a recessive allele for any given trait is three out four or 75% of the time. An instance of a heterozygous genotype is one wherein one allele is dominant and the opposite is recessive.
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What event occurs first during meiosis?
Prophase I marks the start of Meiosis I, the first meiotic division. During prophase I, the chromatin complex containing DNA and protein condenses to create chromosomes.
Sister chromatids are pairs of replicated chromosomes that stay connected at a central place known as the centromere.
Meiosis begins with a parent cell that has two pairs of homologous chromosomes. Following Meiosis I, two haploid cells are formed, each with half the number of chromosomes as the parent cell.
Cells go through four stages throughout each cycle of division: prophase, metaphase, anaphase, and telophase.
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which mass extinction event occurred just before the rapid increase in speciation among mammalian species?
The Cretaceous–Paleogene extinction event, also known as the K-T extinction, occurred approximately 66 million years ago and is believed to be the cause of the rapid increase in speciation among mammalian species.
The Impact of the Cretaceous-Paleogene Extinction Event on Mammalian SpeciationThe Cretaceous–Paleogene extinction event, also known as the K-T extinction, is a major extinction event that occurred 66 million years ago. It is believed to have been caused by an asteroid impact, and is one of the largest extinction events in Earth's history, as it caused the extinction of 75% of all species, including the non-avian dinosaurs. This event also had a profound effect on the evolution of mammals, leading to a rapid increase in speciation. This event is thought to have played a major role in shaping the Earth's current biodiversity.
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there are 80 organisms in a population. in a two allele, dominant-recessive gene pair, there are 20 dominant alleles within the population. what is the gene frequency of the recessive allele? ( 1 pt)
It is calculated by dividing the number of gene copies by the number of times the allele occurs in the population. All the copies of every gene in a population make up the gene pool of that population.
What gene frequency of the recessive allele?An allele's or gene's relative frequency at a certain locus in a population is known as its allele frequency, which is expressed as a fraction or percentage. With regard to the population as a whole or the sample size, it is specifically the percentage of all chromosomes that have that allele.
It is exactly the proportion of all chromosomes that has that allele, with relation to the population as a whole or the sample size.
Therefore, take the square root of q2 to get q, or the frequency of the recessive allele in the population, which is 0.632 (0.632 × 0.632 = 0.4). So, q = 0.63. P must be 1–0.63 = 0.37 since p + q = 1.
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Identify one muscle structure and describe the role the structure plays in muscle contraction.
down the axon of the nerve As just an electrical action potential, the nerve impulse moves along the axon membrane to the axon terminal.
What kind of structure travels the nerve impulse down?axon Dendrites are the starting point for nerve impulses as they travel toward the cell and down the axon.Electrical and chemical impulses from a nerve impulse pass along the neuron.At a synapse, the axon tip terminates.Each axon tip's connection to the following structure is known as a synaptic junction.
What kind of structure is a nerve impulse?A signal that travels across a nerve fiber is known as a nerve impulse.It uses the nervous system's nerves to carry information.A typical neuron includes a cell body with a few dendritic projections.The cell body expands into the axon, a lengthy tube.
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SOS
summarize the effects of human population growth and catastrophic events on ecosystems
describe the sources, types, and effects of varying pollutants
assess the consequences of loss of biodiversity
explain the term sustainable development and describe some of its resource
Answer\Explanation
Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.Housing and feeding so many people has accelerated the destruction of natural habitats, while higher levels of consumption, particularly in some richer parts of the world, have also increased the exploitation of natural resources and led to growing levels of pollution.
when a natural disaster kills off a large proportion of the population, resulting in a severe reduction in the gene pool, it is called
Answer:
bottleneck effect
this is the right answer I suppose :)
In most eukaryotes, only about 1.5% of the genome codes for proteins. what types of sequences make up the rest of the genome?
Remarkably, human DNA codes for proteins only approximately 1 percent of DNA is made up of protein-coding genes; the alternative ninety-nine percent is noncoding. Noncoding DNA does now not provide commands for making proteins.
those types of sequences make up the rest of the genome genes and contain handiest about 1-2% of the 3 billion base pairs of DNA. this means that everywhere from ninety eight-99% of our whole genome needs to be doing something other than coding for proteins – scientists call this non-coding DNA
however genes as they have got traditionally been understood – as stretches of DNA that code for proteins – are only a small part of an organism's genome. In reality, they make up much less than 2% of human DNA
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how accurate are dna paternity tests? by comparing the dna of the baby and the dna of a man that is being tested, one maker of dna paternity tests claims that their test is 100% accurate if the man is not the father and 99.99% accurate if the man is the father.
When a claimed parent is not biologically linked to the kid, the result of a DNA paternity test, known as the "probability of parentage," is 0%. However, when the alleged parent is biologically related to the child, the likelihood of parentage is normally 99.99%.
The most accurate inclusion paternity testing techniques are thought to be 99.99 percent precise. Numerous DNA match spots, or loci, from the infant and the probable father are compared to determine paternity. While some paternity tests simply compare 13 loci, the most reliable paternity tests compare 16 loci. When verifying whether a guy is the biological father of another individual, a DNA paternity test is virtually 100% accurate. Blood tests or cheek swabs can be used for DNA analysis. If you require the findings for legal reasons, the test must be performed at a medical facility.
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disorders typically appear in childhood and are traced to genetic differences, atypical brain development, or prenatal exposure to substances that adversely affect development
The most prevalent mental illnesses in children include depression, ADHD, anxiety issues, and behavior issues.
Learning and developmental disorders, autism, and risk factors including substance abuse and self-harm are among the other ailments and issues that have an impact on children's learning, behavior, and emotions.
The following five ailments are the only ones covered in this chapter: autism, conduct disorder, childhood anxiety disorders, and attention-deficit hyperactivity disorder (ADHD) (intellectual developmental disorder).
Your chance of acquiring a mental disorder may be impacted by a number of variables, including:
a blood relative, such as a parent or brother, has a history of mental illness.challenges in life that are stressful, such having money issues, losing a loved one, or being divorced.a persistent (chronic) illness, as diabetes.Learn more about to childhood visit here;
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Which cells will most likely display mutations that could potentially result in cancer?
Proto-oncogenes cells will most likely display mutations that could potentially result in cancer.
Oncogenes that promote the growth of cancer cells can develop from mutations (changes) in proto-oncogenes. Proto-oncogenes are typically genes that aid in cell growth and division to create new cells or maintain existing cells. A proto-oncogene becomes an oncogene when it is altered (changed) or has an excessive number of copies and is switched on (activated) at an unforeseen period.
Proteins that promote cell proliferation, prevent cell differentiation, and halt cell death are frequently encoded by proto-oncogenes. For healthy human development and organ and tissue preservation, each of these processes is crucial. Proto-oncogenes, which are oncogenes before they undergo mutation, control healthy cell division. When a proto-oncogene mutates into an oncogene and causes uncontrollable cell division and growth, cancer can develop.
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sam injured the articular cartilage of his knee doing damage to his synovial membrane. what effect will the damage to the synovial membrane have on the cartilage in sam's knee?
sam injured the articular cartilage of his knee, doing damage to his synovial membrane. Sam will recover, but with a limp caused by biomechanical deficiencies.
When the ends of two or more bones come together, a joint called articular cartilage is formed. For instance, the tibia (shinbone), femur (thighbone), and patella (kneecap) all connect at the knee. Articular cartilage injuries in joints are common, especially in physically active individuals. Although this form of injury most frequently occurs to the knee, it can also happen to the hip, elbow, shoulder, or ankle. Despite the fact that articular cartilage injuries can be painful and make it difficult to go about your daily activities, there are several therapies available to both reduce uncomfortable symptoms and repair and replace damaged articular cartilage.
The complete question is:
sam injured the articular cartilage of his knee doing damage to his synovial membrane. what effect will the damage to the synovial membrane have on the cartilage in sam's knee?
a) Over a period of time, the cartilages would eventually repair themselves and Sam can expect a full recovery.
b) Sam will recover but with a limp caused by biomechanical deficiencies.
c) The cartilages would no longer receive nutrients and waste products would accumulate causing the cartilage to degenerate.
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Scientists have been able to produce mutations in plants by irradiating their seeds with gamma rays. The result of one of the mutations was a plant that could not produce flowers. Because of this lack of flowers, the plant would not be able to.
The result of one of the mutations was a plant that could not produce flowers. Because of this lack of flowers, the plant would not be able to produce seeds.
The reproductive structures of angiosperms, i.e., the organs that create seeds, are the flowers. plants with flowers. In addition to accessory organs, flowers also have male and female reproductive organs known as stamens and pistils. In flowering plants, fertilization takes place during the pollination process, in which a pollen grain's sperm cell fuses with a plant ovule's egg cell to create the plant embryo in the seed. In conclusion, the plant would not be able to produce seeds because it lacks blossoms.
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Which statement about genetically modified organisms is correct?
O Genes of bacteria can be modified; genes of plants and animals cannot.
O Genes of plants, animals, and bacteria can all be modified.
O Genes of plants can be modified; genes of animals and bacteria cannot.
O Genes of plants, animals, and bacteria cannot be modified.
Answer:
O Genes of plants, animals, and bacteria can all be modified.
Explanation:
Answer: Genes of plants, animals, and bacteria can all be modified. is the correct answer
atrial natriuretic factor question 10 options: is secreted from cells in the right atrium of the heart when blood pressure decreases. causes increased water loss. increases blood volume. increases blood pressure. produces all of these effects.
Option A, Water loss is accelerated by atrial natriuretic factor. By increasing salt excretion, it induces water loss.
Guanylate cyclase is activated in the collecting duct when atrial natriuretic factor receptors are stimulated, which leads to an increase in cGMP synthesis and, in turn, an increase in salt and water excretion. Vasodilation, enhanced vascular permeability, and increased renal excretion of salt and water are at least three of the acute processes through which atrial natriuretic peptide (ANP) reduces plasma volume. In order to promote salt and water excretion (natriuresis), ANP operates on the kidney in the following ways: ANP primarily controls sodium excretion through the medullary collecting duct.
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describe the differences between baleen whales and toothed whales. what type of food do each eat?
Baleen whales and toothed whales are both types of cetaceans, but they differ in many ways.
Baleen whales are typically larger than toothed whales, and while all baleen whales have two blowholes, most toothed whales only have one. Toothed whales also have teeth and a single, well-defined melon, while baleen whales have baleen plates instead of teeth and two fused melons.
Baleen whales feed on small prey such as krill, plankton, and small fish, which they filter from the water using their baleen plates. Toothed whales, on the other hand, feed on larger prey such as squid, octopus, and fish, which they capture with their teeth.
While baleen whales have several hundred to several thousand baleen plates made of keratin in their upper jaw, toothed whales have teeth. Baleen whales are much larger than toothed whales, and they have a much more streamlined body shape.
Baleen whales typically feed on small animals such as krill, plankton, and fish, while toothed whales feed on larger prey such as squid and fish. The baleen whales use their baleen plates to filter small organisms from the water, while toothed whales use their teeth to capture and tear apart larger prey.
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the evolutionary mechanism that allows for species to adapt to the environmental conditions found in their habitat is:_________
The evolutionary mechanism that allows for species to adapt to the environmental conditions found in their habitat is Natural Selection
What is Natural Selection?
An evolutionary mechanism is natural selection. Environment-adapted organisms have a higher chance of surviving and dispersing the genes that contributed to their success. Over time, this mechanism leads to the evolution and divergence of species.
One method to explain the millions of species that have existed on Earth is through natural selection.
Through reproduction, genetic mutations that are advantageous to an individual's survival are passed on. As a result, a new generation of organisms emerges that has a higher chance of surviving and reproducing.
For instance, giraffes have an edge over other species due to their long necks, which have allowed them to graze on leaves that others cannot reach. Because they had access to greater food, individuals with longer necks were able to breed and pass on the trait to the next generation. Shorter-necked individuals would have a lower chance of surviving to pass on their genes and would have less access to food.
Hence the answers is Natural selection
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why is it important to monitor environmental parameters when making policy decisions?
The fundamental goal of environmental monitoring is to control and reduce the environmental impact of an organization's operations.
Either to guarantee adherence to laws and regulations, or to reduce the likelihood of negative effects on the environment and safeguard public health.
What aspects of the environment need to be tracked?Businesses can discover and analyze environmental conditions and evaluate their impact on the environment thanks to environmental monitoring of water, air, and biodiversity. Life on Earth depends on clean air, water, reducing noise pollution, and biomonitoring.
Records generated by monitoring the environment will serve as a baseline for the circumstances in which collections are housed now. They can be applied to record daily, seasonal, and humidity ranges, or they can be used to locate places with inadequate climate management.
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june b. gone, 37-year-old female presenting complaint: left flank pain of 2 weeks' duration. physical examination: lumbar range of motion: within normal limits and nonprovocative. flank percussion positive for reproduction of the chief complaint. laboratory: urinalysis shows albuminuria. diagnostic test: ultrasonography revealed multiple cysts in the upper renal pole. diagnosis: polycystic disease referral to: dr. jones, nephrologist what is a nephrologist?
Any indications of renal disease or other diseases that could harm your kidneys should prompt you to consult a nephrologist.
As to why you would visit a nephrologist.A medical professional who focuses on identifying and treating kidney diseases is known as a nephrologist. Any indications of renal disease or other diseases that could harm your kidneys should prompt you to consult a nephrologist.
The conditions that nephrologists treat.Nephrologists are medical experts that diagnose, treat, and manage acute and chronic kidney illnesses and issues. Along with treating these disorders, they also treat associated ones like high blood pressure, fluid retention, and mineral and electrolyte imbalances.
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what environmental parameters would need to be monitored as ddt moves up the food web of an ecosystem?
Soil and water levels and air quality of environment are the environmental parameters would need to be monitored as DDT moves up the food web of an ecosystem.
A food web is that the natural interconnection of food chains and a graphical illustration of what-eats-what in an ecological community. A food web consists of all the food chains in a very single scheme. Every physical object in an scheme is an element of multiple food chains. Every organic phenomenon is one doable path that energy and nutrients could take as they move through the scheme.
Air quality refers to the degree to that the air is appropriate or clean enough for humans or the atmosphere. smart air quality means that the air is freed from harmful substances.
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Consider the reaction.
2 upper N upper o upper c l double-headed arrow 2 upper N upper O (g) plus upper C l subscript 2 (g).
At equilibrium, the concentrations are as follows.
[NOCl] = 1.4 ´ 10–2 M
[NO] = 1.2 ´ 10–3 M
[Cl2] = 2.2 ´ 10–3 M
What is the value of Keq for the reaction expressed in scientific notation?
1.6 ´ 10–5
6.2 ´ 10–4
6.2 ´ 104
1.6 ´ 105
The value of Keq for the reaction expressed in scientific notation is
1.6 ´ 10–5
The first option is correct.
What are scientific notation?Scientific notation is described as a way of expressing numbers that are too large or too small to be conveniently written in decimal form.
Since equilibrium constant, Keq, is the ratio of product of concentration of products to the product of concentration of reactants each term raised to their stochiometric coefficients.
Where
[NOCl] = 1,4·10⁻² M.[NO] = 1,2·10⁻³ M.[Cl₂] = 2,2·10⁻³ M.K = [NO]² · [Cl₂] ÷ [NOCl]².K = (1,2·10⁻³ M)² · 2,2·10⁻³ M ÷ (1,4·10⁻² M)².Therefore K = 1,6·10⁻⁵.Learn more about scientic notation at: https://brainly.com/question/1767229
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in animals, what is the difference between reproductive cloning and therapeutic cloning?
Reproductive Cloning is the process of creating genetic copies of entire organisms. Therapeutic cloning is the process of creating genetic copies of tissues or organs in order to replace damaged body parts.
Cloning is an asexual reproduction method. A cloned child would be a genetic duplicate of an existing person. If you cloned yourself, the resulting child would be a new species of human being, not your son or daughter or twin brother or sister.
Reproductive cloning would promote a view of children, and individuals in general, as artifacts that may be created and manufactured to have specific characteristics. Reproductive cloning would reduce an individual's sense of uniqueness. It would go against deeply held beliefs about human individuality and freedom, and it could result to a devaluation of clones in contrast to non-clones.
The process of creating a cloned embryo solely with the goal of generating embryonic stem cells that have the same DNA as the donor cell is known as therapeutic cloning. These stem cells can be utilized in experiments to better understand disease and develop new treatments.
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What were Mendel's conclusions?
Mendel came to the idea that there exist discrete hereditary determinants.
These factors are referred to as genes. Each parent's cell has a pair of genes for each characteristic under investigation. One allele again for the dominant phenotype and another for the complex predictive are present in the F1 from the cross of two pure lines.
Mendel's three laws the Law of Multiple Proportions, the Law of Dominance, as well as the Law of Segregation sum up the main ideas of Mendelian inheritance.
He concluded that genes are inherited from each parent as separate, paired units. Mendel observed how parental genes separated and if they showed up as dominant and recessive qualities in the children. He was aware of the mathematical patterns transmitted from one era to the following.
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fill in the blanks with the terms provided within the gray matter of the spinal cord, there are various functional groups of neuron cell bodies called
Within the gray matter of the spinal cord, there are various functional groups of neuron cell bodies called Nuclei .
Interneurons, motor neuron cell bodies, axons, and dendrites are found in the grey matter of the spinal cord's core. Horns are the "wings" or projections of the grey matter. The grey matter is shaped like a H when the grey horns and the grey commissure are combined.
The gray matter of the spinal cord has an H-shaped or butterfly-shaped shape and is made up of neuronal dendrites and cell bodies, unmyelinated axons, and neuroglia.
Gray tissue ,The dorsal horn, intermediate column, lateral horn, and ventral horn columns are the four primary divisions of the gray matter, which is primarily made up of the cell bodies of neurons and glia.
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(03.02 LC)Which of the following is not true about the Law of Conservation of Energy?
O It states that the total energy in the universe keeps increasing.
O It applies to everything in the universe.
O It states that energy is transformed from one form to another.
O It states that energy is neither created nor destroyed.
The total energy in the universe is not increasing the end energy is always the same, regardless of the form of energy, hence option A is correct.
What is the Law of Conservation of Energy?Energy may change into various forms of energy, for instance, potential energy might be changed into kinetic energy. Energy cannot be generated or destroyed.
In response, according to the rule of conservation of energy, energy can only be transformed from one type of energy to another.
Therefore, the end energy is always the same, regardless of the form of energy, hence option A is correct.
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Which event occurs once in meiosis?
Meiosis, like mitosis, comprises separate phases known as prophase, metaphase, anaphase, and telophase. However, during meiosis, each of these phases occurs twice:
once during the first round of division, known as meiosis I, and again during the second round of division, known as meiosis II.
One cell divides twice during meiosis to create four daughter cells. These four daughter cells are haploid, meaning they have half the amount of chromosomes as the parent cell. (eggs in females and sperm in males).
During meiosis, homologous chromosomes are paired, resulting in gene recombination.
Non-sister chromatids exchange genetic material, resulting in novel allele combinations.
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during which surgical procedure is a balloon catheter threaded into the narrowed area of a closed vessel and inflated to stretch the vessel open again?
The main purpose of balloon angioplasty, also known as percutaneous transluminal angioplasty or PTA, is to increase blood flow to the legs.
An arterial blockage or narrowing is treated by inserting a small balloon inside of it, inflating it, and stretching the balloon up the artery to increase blood flow.
Coronary angioplasty, also known as percutaneous coronary intervention, is a procedure used to clear blocked heart arteries (AN-jee-o-plas-tee). A tiny balloon catheter is placed during an angioplasty procedure to assist widen a blood artery that has become narrowed and enhance blood flow to the heart. A thin wire mesh tube known as a stent is frequently inserted in addition to an angioplasty. The stent aids in keeping the artery open, reducing the likelihood of further narrowing. To keep the artery open, medication is typically coated on the majority of stents. Bare-metal stents are used infrequently.
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______ occurs when impulses from an organ are perceived as originating from the skin.
Referred pain occurs when impulses from an organ are perceived as originating from the skin.
Referred pain occurs when impulses from specific viscera are perceived as coming from the skin rather than the organ. Numerous cutaneous and visceral sensory neurons send nerve impulses up the spinal cord's ascending tracts.
The stimulus causes the sensory cell to generate an action potential, which is relayed to the central nervous system (CNS), where it is combined with other sensory information—or, in some cases, higher cognitive functions—to form a conscious perception of that stimulus. The skin contains numerous sensory receptors in the epidermis, dermis, and hypodermis that allow for touch discrimination such as pressure differences (light vs. deep). Temperature, pain, and itch are examples of external world qualities assessed by skin sensory receptors.
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The autonomic nervous system may cause activation or inhibition, depending on the division that is active and the target that is affected.
a. True
b. False
True, Depending on the division that is activated and the target that is impacted, the autonomic nervous system may result in activation or inhibition.
What part of the autonomic nervous system is the source of inhibition?Acetylcholine is frequently utilized to suppress the parasympathetic nervous system. Norepinephrine frequently acts as a stimulant for the body through the sympathetic nervous system.
What takes place after the autonomic nervous system is engaged?Your sympathetic nervous system becomes active in these circumstances to help you escape danger by increasing your heart rate, delivering more blood to your body's oxygen-depleted regions, and other actions.
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