During the defecation reflex, the
A) stretch receptors in the rectal walls stimulate parasympathetic motor neurons.
B) internal and external anal sphincters relax simultaneously.
C) abdominal wall relaxes and the internal abdominal pressure decreases.
D) gastroileal reflex moves materials into the rectum through mass peristalsis.
E) decreased peristaltic contractions occur in the sigmoid colon and rectum.

Question

Quizplus · Accepted Answer

The defecation reflex is initiated when stretch receptors in the rectal walls are activated, which in turn stimulate parasympathetic motor neurons to facilitate the process.

During the Defecation Reflex, the