Which of the following best defines peristalsis?
A) It is the static or quiet period between meals when the GI tract is empty.
B) It is the constant rate of contraction along the GI tract when food is present.
C) It is contraction of parallel and circular muscles found in the walls of the intestines but not the stomach.
D) It is wavelike muscular contractions resulting from alternate tightening and relaxing of circular and longitudinal muscles of the GI tract.
Correct Answer:
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B) backward
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