List out the sphincter muscles of the food canal you have observed and give a brief description? (AS1)

a) Pyloric sphincter: This sphincter is present in between the stomach and the duodenum and controls the passage of chyme out of the stomach and into the intestines.

b) Oesophaegeal sphincter: this sphincter is present at the end of oesophagus and beginning of stomach and allows the passage of bolus into the stomach. It is mostly closed in order to stop any flow of acid and digestive juices into the oesophagus.

c) Anal sphincter: this sphincter is present at the end of the anus and controls the passage of excreta out of the body.