The part of the CNS that is directly involved in the defecation reflex is the:
A)hypothalamus
B)spinal cord
C)cerebrum
D)medulla

Question

Quizplus · Accepted Answer

The defecation reflex is a spinal reflex, which means it is controlled by the spinal cord. The spinal cord receives sensory information from the rectum, and then sends motor signals to the rectum and anal sphincter muscles to coordinate defecation. The hypothalamus, cerebrum, and medulla are all involved in various aspects of digestion and elimination, but they are not directly involved in the defecation reflex.

The Part of the CNS That Is Directly Involved in the Defecation