About Lesson
Digestion in the Stomach
The bolus enters the stomach through a muscular valve known as the cardiac sphincter.
The stomach wall is made up of thick circular muscle and longitudinal muscle layers.
These muscles contract and relax producing movements that mix the contents of the stomach.
The mixing is known as churning and results in the formation of a fluid called chyme.
The presence of food in the stomach stimulates the secretion of the hormone gastrin which in turn stimulates the production of gastric juice from the gastric glands embedded in the glandular layer of stomach wall.
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