Question

which of the following statements correctly characterizes intestinal peristalsis? a. peristalsis results from sequential contraction and relaxation of circular and longitudinal muscle layers within the muscularis externa. b. small intestinal peristalsis occurs more frequently and is more easily identifiable with sonography, as compared to large intestinal peristalsis. c. large intestinal peristalsis is characterized by infrequent, forceful, yet short-lived mass movements of colonic contents. d. all of the above e. none of the above

Answer 1

The muscularis external's circular and longitudinal muscle layers contract and relax one after the other, producing peristalsis.

Food is moved through the digestive tract by a sequence of wave-like muscle contractions called peristalsis. The process begins in the esophagus, where powerful waves of smooth muscle transport balls of swallowed food to the stomach. The food is then broken down into a liquid substance called chyme there, where peristalsis proceeds. It may be simpler to see the wave-like action if you stretch out a segment of intestine. The chyme is mixed and shifted back and forth by the action. As a result, nutrients can be absorbed by the bloodstream through the small intestine's walls. Peristalsis in the large intestine aids in the absorption of water from undigested food into the blood stream.

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