Which of the following can trigger a defecation reflex?
A) accumulation of chyme in the large intestine
B) flatulence
C) decomposition of bilirubin
D) distension of the rectal wall
E) haustral churning

Question

Quizplus · Accepted Answer

Distension of the rectal wall triggers the defecation reflex, which initiates the relaxation of the internal anal sphincter and the contraction of the smooth muscles of the rectum, resulting in the expulsion of feces. Accumulation of chyme in the large intestine, flatulence, decomposition of bilirubin, and haustral churning do not directly trigger the defecation reflex.

Which of the Following Can Trigger a Defecation Reflex