In peristalsis,
A)the entire tube (i.e. ,esophagus)contracts at once.
B)short segments alternate contraction and relaxation.
C)food can move forward or backward.
D)contraction can only occur when food is present.

Question

Quizplus · Accepted Answer

Peristalsis involves short segments of contraction and relaxation that alternate to push food through the digestive tract in one direction. Food cannot move backward during peristalsis. The entire tube does not contract at once, and peristalsis can occur even when food is not present (such as during mass movements in the large intestine).

In Peristalsis