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Essay Galaxy - Digestive System
Digestive System
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 digestive system of humans and other higher animals is the group of organs that changes food--carbohydrates, fats, and proteins--into soluble products that can be used by the body. Both mechanical action and chemical action are necessary to change food into products that are usable by the body.
Human digestion, or the change that food undergoes in the digestive system, takes place in a long tubelike canal called the alimentary canal, or the digestive tract. There is good reason why the passageway used by food to travel through the body is called the alimentary canal. Just as canals are constructed to ....
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Number Of Pages: 6 |
Number Of Words: 1471 |
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