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What initiates a signal for defaecation?

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in Biology – Class 11 by (272k points)
What initiates a signal for defaecation?

(a) Faeces in the colon

(b) Faeces in the rectum

(c) Faeces in the caecum

(d) Faeces in the ileum

I have been asked this question in unit test.

This interesting question is from Disorders in Digestive System topic in division Digestion and Absorption of Biology – Class 11

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The correct choice is (b) Faeces in the rectum

For explanation I would say: The digestive wastes, solidified into coherent faeces in the rectum initiate a neural reflex causing an urge or desire for its removal. Defaecation is a voluntary process and is carried out by mass peristaltic movements.

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