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garri49 [273]
3 years ago
9

What initiates the defecation reflex?

Medicine
1 answer:
svetlana [45]3 years ago
6 0

Answer:

The chyme, which is already a fecal bolus formed produces an involuntary stimulus reaching the colon that cause the defecation; The first step is the relaxation of the internal sphincter through the sacral nerve (involuntary), and then voluntarily the cerebral cortex through the pudendal nerves that relax the external sphincter.

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