The Defecation Reflex

question 208

Multiple Choice

The defecation reflex

• A) is initiated when mass movements force fecal material into the rectum, stimulating stretch receptors in the rectal wall.
• B) involves relaxation of the internal anal sphincter and contraction of the sigmoid colon and rectum.
• C) can be overridden by voluntary contraction of the external anal sphincter.
• D) both (a) and (b) above.
• E) all of these answers.

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