Gi Tract

Topics: Digestion, Stomach, Digestive system Pages: 2 (640 words) Published: March 22, 2012
The Small Bowel
The small intestine is divided into three structural parts, Duodenum, Jejunum and Ileum, it is the part of the gastrointestinal tract following the stomach and followed by the large bowel. The inner wall, or mucosa, of the small intestine is lined with project microscopic finger-like pieces of tissue called villi. Digested food is able to pass into the blood vessels in the wall of the intestine via these villi. It is the site where most of the nutrients from ingested food are absorbed. The average length of the small intestine in an adult human is approximately 7 meters. The Large bowel

The large bowel is approximately 1.5metres long. It is the second-to-last part of the digestive system, the final stage of the alimentary canal is the anus. The large intestine takes about 16 hours to finish up the remaining processes of the digestive system. Food is no longer broken down at this stage of digestion. The colon absorbs vitamins which are created by the colonic bacteria - such as vitamin K. The wall of the large intestine is lined with simple columnar epithelium.

How It Works

The digestive system is made up of a series of hollow long, twisting tubes from the mouth to the anus, and other organs that help the body break down and absorb food

Organs that make up the digestive tract are the mouth, oesophagus, stomach, small intestine, large intestine (also called the colon), rectum, and anus. Inside these organs 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. The digestive tract also contains a layer of smooth muscle that helps break down food and move it along the tract.

Movement of Food through the System
The large organs of the digestive tract contain a layer of muscle that enables their walls to move. The movement of organ walls can propel food and liquid through the system and also can mix the contents within each organ. Food moves from...
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