The sphincter that opens when food or fluids exert pressure on it is the gastroesophageal sphincter. Closure of the sphincter is under the control of the vagus nerve.
The sphincter that opens when food or fluids exert pressure on it is called the lower esophageal sphincter (LES).
Lower esophageal sphincter is the sphincter that opens when food or fluid exert pressure on it. It is located at the junction of the esophagus and stomach, allowing food to enter the stomach after swallowing.
Esophageal, duodenal, urethral, and anal would all seem to fit that description.
sphincter
yes
at the level of the first lumbar vertebra
The lower esophageal sphincter keeps food from coming back up, or vomiting. When you have to vomit, the sphincter opens allowing the food to come back up. There is another sphincter, the pyloric sphincter which leads into the small intestine. Hope this helps!
The pyloric sphincter regulates passage of chymefrom the stomach
The internal urethral sphincter opens in response to signals from the autonomic nervous system, particularly the parasympathetic nervous system. This relaxation allows urine to flow from the bladder into the urethra for expulsion.
The pyloric sphincter is a valve that opens and closes to allow chyme to leave the stomach and enter the duodenum. The cardiac sphincter is a valve that opens and closes to prevent stomach acid from going up the esophagus.
The external anal sphincter is under voluntary control. You have the urge to defecate because your internal anal sphincter involuntarily opens, but you can keep yourself from going to the bathroom because your external anal sphincter is voluntarily closed. Hope that helps!
The pyloric sphincter opens in response to the presence of food in the stomach. This triggers a reflex that relaxes the sphincter, allowing food to pass into the small intestine. The sphincter closes to prevent the backflow of intestinal contents back into the stomach.