What is a sphincter?

Answer 1

That is the smartest muscle in your body. It is the only one that knows the difference between a solid, liquid, and a gas.

Answer 2

A sphincter is a circular muscle which normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. There are at least 42 different sphincters in the human body, some of them microscopic in size.

Some examples of sphincters include:

The sphincter pupillae, or pupillary sphincter, belonging to the iris in the eye.
The orbicularis oris muscle, a muscle around the mouth.
The cardia/lower esophageal sphincter, or cardiac sphincter at the upper portion of the stomach. This sphincter prevents the acidic contents of the stomach from moving upward into the esophagus.
The pyloric sphincter, at the lower end of the stomach.
The sphincter of Oddi, or Glisson's sphincter, controlling secretions from the liver, pancreas and gall bladder into the duodenum.
The sphincter urethrae, or urethral sphincter, controlling the exit of urine from the body.
At the anus,there are two sphincters which control the exit of feces from the body.

Answer 3

A sphincter is a circular muscle which normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. There are at least 42 different sphincters in the human body, some of ... The sphincter pupillae, or pupillary sphincter, belonging to the iris

Answer 4

A sphincter is a circular muscle which normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. There are at least 42 different sphincters in the human body, some of them microscopic in size.

Answer 5

Everyone has two.. one sits at the botton of the esophagus which is like a draw string, it opens up when we are eating to allow the food to enter the stomach. The other one is by the colon which allows all the waste to leave the body. so after you eat and if your stomach can not hold any more food the sphincter closes off so no more food can go there until there is enough room. hope it helps

Answer 6

It's a circular muscle. The most well known one is the anal sphincter, of course. However, you also have others, like the cardiac sphincter, that controls the opening and closing of the top of the stomach (if it fails, you get reflux and heartburn).

Answer 7

a sphincter is not just a butthole believe it or not, it is technically a band of muscle whose function is to close/retain fluids or other bodily secretions (mainly in the GI tract) . The human body actually has several, for instance - the lower esophageal sphincter which keeps your stomach contents from refluxing into the esophagus. Babies often spit up/ projectile vomit because this sphincter does not mature for several months after birth.

and yes...the butthole is another one.

Answer 8

President Bush is a sphincter.

Answer 9

A sphincter says what?

Anyway, without being too graphic, the ring-like muscle at the outer end of the anus. In layman's terms, a bunghole.

Answer 10

A sphincter is a bone or nerve ending in your anus.. it is what gives you a good feeling when you take a **** or put something inside your anus.

Answer 11

Ted Kennedy