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Digestive System
Beginning of essay
The human body uses various kinds of food for energy and growth. To be used, however, food must be changed into a form that can be carried through the bloodstream. The body's process of extracting useful nutrients from food is called digestion.
The of humans and other higher animals is the grou ....
Middle of essay
....s being swallowed. Peristalsis, a wavelike muscular movement of the esophagus walls, forces food down the tube to the stomach.
Peristalsis takes place throughout the digestive tract. It is an automatic, or involuntary, action, carried out in response to nerve impulses set up by the contents of the tube. When digestion is working normally, a person is unaware of the movements of the gullet, stomach, and most of the intestine. Swallowing is a voluntary muscular action.
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| Number of words: 1451 |
Approximate pages: 6 |
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