A sphincter is a circular muscle that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. Sphincters are found in many animals. There are over 60 types in the human body, some microscopically small, in particular the millions of precapillary sphincters. Sphincters relax at death, often releasing fluids and feces. Each sphincter is associated with the lumen (opening) it surrounds. As long as the sphincter muscle is contracted, its length is shortened and the lumen is constricted (closed). Relaxation of the muscle causes it to lengthen, opening the lumen and allowing the passage of liquids, solids, or gases. This is evident, for example, in the blowholes of numerous marine mammals. Many sphincters are used every day in the normal course of digestion. For example, the lower esophageal sphincter (or cardiac sphincter), which resides at the top of the stomach, is closed most of the time, keeping acids and other stomach contents from pushing up and into the esophagus, but opens to let swallowed food pass into the stomach.
There it is! LFG!
A sphincter is a circular muscle that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. Sphincters are found in many animals. There are over 60 types in the human body, some microscopically small, in particular the millions of precapillary sphincters. Sphincters relax at death, often releasing fluids and feces.
Each sphincter is associated with the lumen (opening) it surrounds. As long as the sphincter muscle is contracted, its length is shortened and the lumen is constricted (closed). Relaxation of the muscle causes it to lengthen, opening the lumen and allowing the passage of liquids, solids, or gases.
This is evident, for example, in the blowholes of numerous marine mammals.
Many sphincters are used every day in the normal course of digestion. For example, the lower esophageal sphincter (or cardiac sphincter), which resides at the top of the stomach, is closed most of the time, keeping acids and other stomach contents from pushing up and into the esophagus, but opens to let swallowed food pass into the stomach.
hey TJ!
tadolf bitler
how do you get that model swap
what ur camera settings ?
late ah post cuh
@@Kdawg14 Ong Bluds on 1m ping but hight point aoon