What involuntary muscular action in the colon pushes waste out during the final step of defecation?
Answer
Peristalsis
The physical act of expulsion, or defecation, is governed by specific muscular mechanics within the lower digestive tract. Once waste material has reached the rectum, signaling that the colon has completed its water absorption duties, the body initiates the movement that forces the waste out. This propulsive movement is achieved through peristalsis, which is described as an involuntary muscular action occurring within the walls of the colon. Issues related to the efficiency of this action, such as slow transit time, can result in prolonged contact between waste and the colon lining, potentially leading to excessive water reabsorption and resulting in harder stools.
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