The main purpose of the sphincter is to control or limit a passage way to one direction. There are two main sphincters in pigs, the cardiac sphincter that controls the passageway from the esophagus into the stomach. And the pyloric sphincter that controls the passageway into the duodenum.
The auditory tubes mark the opening of the nasopharynx in the fetal pig. The purpose of these tubes is the beginning of development for the ears.
As in most mammals, the saliva in a pig functions to both moisten ingesta and to start breaking down sugars through the actions of amylase in the saliva.
The cranium in a fetal pig, just like in humans, serves to protect the brain. It also provides structure and support for the head, and allows for the attachment of muscles and ligaments necessary for head movement.
it is the thing that passes throug the stomach
It is spelled "guinea pig". You got it right! :)
Controls passive from the esophagus into the stomach.
Sphincters prevent material from flowing backwards, like the pyloric sphincter in the stomach.
outer anal sphincter
ileocecal sphincter (valve)
The auditory tubes mark the opening of the nasopharynx in the fetal pig. The purpose of these tubes is the beginning of development for the ears.
Pyloric sphincter is located at the base of the stomach and is the contracting ring of muscle which guards the entrance of the to small intestine.
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
The main purpose of the upper esophageal sphincter is to control the passage of food and liquids from the pharynx into the esophagus during swallowing, while also preventing reflux of stomach contents back into the throat.
Sphincter of Oddi.
cardiac sphincter/lower esophageal sphincter (LES)
The main purpose of the invasion was to topple the revolutionary regime of Fidel Castro