what is the function of the rectum
Answers
The rectum is the last stop before the feces is eliminated through the anal canal. Similar to the colon electrolytes are absorbed (sodium, potassium, chloride) and indigestible food ingredients are decomposed by anaerobic bacteria. The stool is thickened through water absorption and mixed with mucus.
Furthermore the rectum is part of the continence organ and plays an important role in the mechanism of defecation. If stool enters the rectal ampulla which is usually empty it is registered by stretch receptors. The information is transferred to the central nervous system giving the person the urge to defecate. He can now decide to either initiate or delay the defecation by relaxing or tensing the levator ani muscle and sphincter ani externus muscle.
However the rising pressure in the ampulla leads to an increasing relaxation of the involuntary smooth corrugator cutis ani muscle and sphincter ani internus muscle (rectoanal inhibitory reflex) which is why holding in the stool for a long time involves an increasing “effort”. The rectum supports the defecation through contraction. Additionally the intra-abdominal pressure is increased through the voluntary tension of the diaphragm and abdominal muscles (abdominal press).
Answer:
It is the pressure increase die to the voluntary tension of abdominal muscles
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