Which of these statements does NOT apply to the colon
A)When mass movements propel feces into the rectum, stimulation of the stretch receptors in the rectal wall reflexively causes contraction of the internal and external anal sphincters to prevent defecation from occurring until an opportune time.
B)Local bacteria digest cellulose for their own growth and reproduction.
C)Absorption of salt and water converts contents into fecal material.
D)No digestive enzymes are secreted.

Question

Quizplus · Accepted Answer

The statement in A is incorrect because when mass movements propel feces into the rectum, stimulation of the stretch receptors in the rectal wall reflexively causes relaxation of the internal anal sphincter (not contraction) and a conscious decision is required to relax the external anal sphincter to allow defecation.

Which of These Statements Does NOT Apply to the Colon