Identify the correct definition of peristalsis.
A. Peristalsis refers to the abnormal involuntary repetitive body movements caused by a distortion of voluntary muscle movement.
B. Peristalsis is a wavelike movement in which circular contraction and relaxation of the intestinal muscles moves contents toward the rectum.
C. Peristalsis is the process in which water moves across membranes following the movement of sodium ions.
D. None of these are correct.
Answer: B
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