Which Statement Concerning Defecation Reflex Is NOT Correct

question 211

Multiple Choice

Which statement concerning defecation reflex is NOT correct?

• 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 and contraction of the sigmoid colon and rectum.
• C) It cannot be overridden by voluntary contraction of the external anal sphincter.
• D) a and b

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