Which is an example of mechanical digestion that occurs in the human digestive system?

A. Saliva in the mouth acts to moisten and break apart food molecules.

B. The muscular lining of the esophagus pushes food from the mouth to the stomach.

C. The muscular walls of the stomach act to churn food back and forth.

D. Small molecules, such as glucose, are absorbed into the blood from the small intestine.

Answer:

Saliva in the mouth acts to moisten and break apart food molecules

An example of mechanical digestion that occurs in the human digestive system is saliva in the mouth acts to moisten and break apart food molecules.

Mechanical digestion entails physically breaking down food substances into smaller particles so that chemical digestion can proceed more quickly.

Chemical digestion involves digestive enzymes further degrading the molecular structure of ingested compounds into a form that can be absorbed into the bloodstream.

Thus, the correct option is A. Saliva in the mouth acts to moisten and break apart food molecules.

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