Which statement is NOT true of the defecation reflex?
A)Voluntary control is provided by the external anal sphincter.
B)The internal anal sphincter contracts.
C)The reflex is integrated in the spinal cord.
D)The reflex is stimulated when feces stretch the rectum.

Question

Quizplus · Accepted Answer

The internal anal sphincter relaxes, not contracts, during the defecation reflex to allow feces to be expelled.

Which Statement Is NOT True of the Defecation Reflex