Thursday, 27 April 2017

The human digestive system

The food we eat has to be broken down into other substances that our bodies can use. This is called digestion. Without digestion, we could not absorb food into our bodies and use it. Digestion happens in the digestive system, which begins at the mouth and ends at the anus. The digestive system is made up of the gastrointestinal (GI) tract—also called the digestive tract—and the liver, pancreas, and gallbladder. The GI tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine—which includes the rectum—and anus. Food enters the mouth and passes to the anus through the hollow organs of the GI tract. The liver, pancreas, and gallbladder are the solid organs of the digestive system. The digestive system helps the body digest food. 
After we swallow, our food passes through these organs in turn: esophagus or gullet stomach small intestine large intestine Stages of digestion Different things happen to food as it passes through the digestive system: food is digested in the mouth, stomach, and small intestine digested food is absorbed into the bloodstream in the small intestine excess water is absorbed back into the body in the large intestine any undigested food passes out of the anus as feces when we go to the toilet 
Information from: http://www.bbc.co.uk/education/guides/z9pv34j/revision https://www.niddk.nih.gov/health-information/digestive-diseases/digestive-system-how-it-works 
Image from: http://www.bbc.co.uk/education/guides/z9pv34j/revision

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