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7 years ago
What causes peristalsis?
A) contraction of the circular muscle layer and relaxation of the longitudinal muscle in the proximal segment coupled with the contraction of longitudinal muscle and relaxation of the circular muscle in the distal segment
B) contraction of the circular muscle layer and relaxation of the longitudinal muscle at the same segment
C) relaxation of the circular muscle layer and contraction of the longitudinal muscle in the proximal segment coupled with the relaxation of longitudinal muscle and contraction of the circular muscle in the distal segment
D) relaxation of the circular muscle layer and contraction of the longitudinal muscle at the same segment
E) contraction of both the circular muscle layer and longitudinal muscle in the proximal segment coupled with the relaxation of both the circular muscle layer and longitudinal muscle in the distal segment
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