Cancer and Bowel movement


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Defecation is the act or process by which organisms eliminate solid or semisolid waste material (feces) from the digestive tract via the anus. Humans expel feces with a frequency varying from a few times daily to a few times weekly; sloths can go a week without expelling.Waves of muscular contraction known as peristalsis in the walls of the colon move fecal matter through the digestive tract towards the rectum. Undigested food may also be expelled this way; this process is called egestion.

The rectum ampulla (anatomically also: ampulla recti) acts as a temporary storage facility for the unneeded material. As the rectal walls expand due to the material filling it, stretch receptors from the nervous system located in the rectal walls stimulate the desire to defecate. If the urge is not acted upon, the material in the rectum is often returned to the colon wheremore water is absorbed. If defecation is delayed for a prolonged period the fecal matter may harden, resulting in constipation.







Channel: Education
Uploaded: January 14, 2008 at 11:55 pm
Author: ColonCancerInfo

Length: 00:05:13
Rating: 4.33
Views: 1750

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