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 actually relaxes, not contracts, during the defecation reflex to allow the passage of feces.

Which Statement Is NOT True of the Defecation Reflex