Which Statement Does NOT Correctly Describe the Defecation Reflex

question 6

Multiple Choice

Which statement does NOT correctly describe the defecation reflex?

• A)It is initiated when mass movements force fecal material into the rectum, stimulating stretch receptors in the rectal wall.
• B)It involves relaxation of the internal anal sphincter.
• C) It cannot be overridden by voluntary contraction of the external anal sphincter.
• D) It involves contraction of the sigmoid colon and rectum.

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