It is relatively simple for round shaped sphincters to either dilate or contract.
To control the bowl motion
outer anal sphincter
What is the function of the cardiac sphincter?
cricopharyngeal sphincter
ileocecal sphincter (valve)
cardiac sphincter; or gastroesophageal sphincter; or lower esophageal sphincter (LES); or esophageal sphincter from http://en.wikipedia.org/wiki/Cardia
The pyloric sphincter regulates passage of chymefrom the stomach
Sphincter of Oddi.
cardiac sphincter/lower esophageal sphincter (LES)
Sounds like a deer mouse.
Not that sphincter but yes they do have one of their own.
What is the function of the cardiac sphincter?