The movement of the walls of the stomach is accomplished by a group of smooth muscle that undergoes what is called peristaltic action.
bowel movement
your bowl system
movement of chyme from the stomach to the small intestine is regulated by what
You may be pregnant.
by pyloric spincter :(
Symptoms of a cramping stomach and vomiting when having a bowel movement should be addressed by a physician. This may be a stomach virus or it may have a more serious meaning and should be evaluated.
The stomach walls contract and relax in a process called peristalsis to help mix and break down food. This movement helps propel food to the small intestine for further digestion and absorption of nutrients.
The valve that controls the movement of food between the stomach and small intestine is called the pyloric sphincter. It regulates the passage of partially digested food from the stomach into the small intestine for further digestion and absorption.
I would say that the stomach is anterior and superior to the small intestine.
pyloric valve
Pyloric valve
It is called Peristalsis.