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

Explanation

1) a) The sphincters that are present in the food canal are Esophased sphincter , Cardiac sphincter , Pyloric sphincter and Anal sphincter.
b) Esophageal sphincter allows entry of bolus into the esophagus . It also reduces back flow from the esophagus to pharynx.
2) Cardiac sphincter is present where the esophagus meets the stomach. From its location , almost directly in front of the heart.
3) Pyloric sphincter is present at the opening called the pylorus , located at the end of the stomach , at the connection between stomach and small intestine.
4) Anal sphincter is located at the anus , which marks the end of the digestive tract.
5) The release of waste from the rectum is controlled partly , voluntarily by anal sphincter located at the anus.
6) It's critical function is to limit the reflex of colonic contents into the ileum.