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Human Digestive System

Single-celled organisms can directly take in nutrients from their outside environment. Multi-cellular animals, with most of their cells removed from contact directly with the outside environment, have developed specialized structures for obtaining and breaking down their food.
The human digestive system is a complex series of organs and glands that processes food. It is a coiled, muscular tube (6-9 meters long when fully extended) extending from the mouth to the anus. Inside this tube is a lining called the mucosa. In the mouth, stomach, and small intestine, the mucosa contains tiny glands that produce juices to help digest food. This tube also includes the pharynx, esophagus, large intestine, and anus.
The digestive system is responsible for converting the food we eat into energy for our bodies to use. In order to use the food we eat, our body has to break the food down into smaller molecules that it can process; it also has to excrete...

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Title: Human Digestive System
Approximate word count: 1089
Approximate pages: 5 (250 words per double-spaced page)

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1. Human Digestive System
   

   Human Digestive System. Human Digestive System Single-celled organisms can
   directly take in nutrients from their outside environment. ...

2. Human Digestive System
   

   Human Digestive System. Human Digestive System Single-celled organisms can
   directly take in nutrients from their outside environment. ...

3. Human Body System Interaction
   

   ... The main systems of the human body are ... endocrine respiratory, circulatory, immune,
   digestive, excretory, skeletal ... The nervous system includes the brain, spinal ...

4. Human Body
   

   Human Body. The Human Body The Human is composed of organized cells that form systems
   to maintain our health. ... Also the digestive system which breaks down food. ...

5. The Digestive System
   

   ... 1999; Dubois, Andre. "Digestive System." World Book Multimedia Encyclopedia. ...
   1999; Lindsay, Mary. The Visual Dictionary of the Human Body. ...