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White raven [17]
3 years ago
12

Defecation depends on

Biology
1 answer:
ASHA 777 [7]3 years ago
6 0

Answer: the correct answer is d. all of the above must happen for defecation to occur.

Explanation:

In response to the distention of the rectal wall, the receptors send sensory nerve impulses to the sacral spinal cord. Motor impulses from the cord travel along parasympathetic nerves back to the descending colon, sigmoid colon, rectum, and anus. The resulting contraction of the longitudinal rectal muscles shortens the rectum, thereby increasing the pressure within it. This then opens the internal sphincter.

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