Anus, Other Subject

The anus is the last part of the digestive tract. It is a 2-inch long canal consisting of the pelvic floor muscles and the two anal sphincters (internal and external). The lining of the upper anus is specialized to detect rectal contents. It lets you know whether the contents are liquid, gas, or solid. The anus is surrounded by sphincter muscles that are important in allowing control of stool. The pelvic floor muscle creates an angle between the rectum and the anus that stops stool from coming out when it is not supposed to. The internal sphincter is always tight, except when stool enters the rectum. It keeps us continent when we are asleep or otherwise unaware of the presence of stool. When we get an urge to go to the bathroom, we rely on our external sphincter to hold the stool until reaching a toilet, where it then relaxes to release the contents.

Most of the digestive tract is a tube composed of four layers:

The serosa, or outermost layer.

The muscularis externa, whose two sets of muscles produce the waves of contraction, called peristalsis, that move food along.
The submucosa, which contains blood vessels and nerve tissue that control digestion. The mucosa-epithelial layer, which absorbs digested food.

Posted Date: 3/19/2013 6:18:28 AM | Location : United States







Related Discussions:- Anus, Assignment Help, Ask Question on Anus, Get Answer, Expert's Help, Anus Discussions

Write discussion on Anus
Your posts are moderated
Related Questions
How do I create a thesis

RISK IN DIGITAL CURRENCY Exchange risk Digital gold currency is a structure of agent money as it openly represents gold metal on drop or in custody, and denominated in un

mention the characteristics of statistics. explain two application of statistics?

#questionHow did treaties,alliances,and political structures contribute to World War 2?..



Most U.S. supreme court cases involve issues which affect a lot of people true or false

you being a teacher describe your experience regarding the role of school parent and peers in imparting family life education.


AskExplain why Aaron Feuerstein felt his decisions were necessary for his company and for his employees. Discuss the pros and cons of Aaron Feuerstein''s decision making, and ex