Voluntary control of the defecation reflex is provided by the:
A)external anal sphincter
B)internal anal sphincter
C)spinal cord
D)rectum

Question

Quizplus · Accepted Answer

The external anal sphincter is under voluntary control and can be contracted to prevent the defecation reflex. The internal anal sphincter is not under voluntary control, and the spinal cord and rectum are involved in the reflex itself.

Voluntary Control of the Defecation Reflex Is Provided by The