PHYSIOLOGY
GASTROINTESTINAL PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Reflected contractions of his muscles and the desire to defecate.
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The desire to defecate.
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parasympathetic innervation
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None of the above
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Detailed explanation-1: -As the fecal mass presents to the rectum, this causes distension. The sensation of rectal distension is transmitted by the parasympathetic nerves (S2-S4), which induces relaxation of the rectoanal inhibitor reflex and contraction of the rectoanal contractile reflex.
Detailed explanation-2: -The external sphincter muscle is a “voluntary” muscle; you have control over this muscle. It assists in keeping the stool in the rectum until you are ready to have a bowel movement. In fact, squeezing the external sphincter muscle pushes the stool out of the anal canal (5) and the rectum relaxes.
Detailed explanation-3: -The gastrocolic reflex is a physiological reflex that controls the motility of the lower gastrointestinal tract following a meal. As a result of the gastrocolic reflex, the colon has increased motility in response to the stretch of the stomach with the ingestion of food.