A hospital client with impaired mobility has rung his call bell for assistance with transferring from his bed to a commode in order to have a bowel movement. The urge to defecate is triggered by
A) Pressure on the peritoneal membrane
B) Friction of stool against the sigmoid colon
C) Distention of the rectum by stool
D) Osmotic changes in the lower bowel
C
Feedback:
The increased peristalsis of the gastrocolic reflex usually precedes defecation. Its accelerated wavelike movements, sometimes perceived as slight abdominal cramping, propel stool forward, packing it within the rectum. As the rectum distends, the person feels the urge to defecate. The urge to defecate does not result from friction on the colon, pressure against the peritoneum, or osmotic changes.
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