Which of the following statements best communicates the nature of movements in the colon?
A)
The internal and external anal sphincters control the movement of feces into and through the colon.
B)
Haustrations move the colon contents along with 2- to 3-minute rest periods between movements.
C)
Segmentation waves ensure that all surfaces of the feces are exposed to the colon surface.
D)
Large segments of the colon contract as a unit for around 30 seconds.
Ans:
D
Feedback:
The colon, unlike the small intestine, moves contents by the simultaneous contraction of large segments. The anal sphincters control defecation rather than movements within the colon, and haustrations perform mixing, not motility. Segmentation waves are present in the small intestine.
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