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Digestive System
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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 group of organs that changes food--carbohydrates, fats ....
Middle of paper
....with quantities of liquid to avoid chewing.
From the mouth the food is swallowed into a transport tube, named the esophagus, or gullet. A flap called the epiglottis closes the windpipe while food is being swallowed. Peristalsis, a wavelike muscular movement of the esophagus walls, forces food down the tube to the stomach.
Peristalsis takes pl.... |
| Word count: 1451 |
Page count: 6 |
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