It is relatively simple for round shaped sphincters to either dilate or contract.
A rat's sphincter is a muscular ring that helps control the entry and exit of substances from its digestive system. It regulates the passage of food and waste materials through the digestive tract.
outer anal 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
Sounds like a deer mouse.
cardiac sphincter/lower esophageal sphincter (LES)
Sphincter of Oddi.
What is the function of the cardiac sphincter?
Not that sphincter but yes they do have one of their own.
The small intestine is a slender coiled tube that receives partially digested food from the stomach (via the pyloric sphincter). It consists of three sections: duodenum, ileum, and jejunum.
esophagal sphinter is a sphincter is actullal found there end of esophagous,