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Week 2 Checkpoint - human digestion

Week 2 Checkpoint - human digestion - As food travels...

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The digestive system is a chain of organs and glands that breaks down the food we eat in order for our bodies to receive the nutrients it needs. Digestion begins before we even place food in our mouths. The smell sets our mouths to watering in anticipation of the taste. Once the food enters out mouth teeth break the food into smaller bits and saliva moistens the food turning it into a bolus. The bolus then moves into the pharynx where it is swallowed moving the bolus into the esophagus. The esophagus is a tube that connects the stomach to the pharynx. Muscles move the bolus through the esophagus and into the stomach where it is mixed with acids produced by the stomach and turned into chyme. Chyme is a partially liquid food mass. The food is partially digested in the stomach and the chyme is passed into the small intestine where most of the digestion and absorption of nutrients takes place. The small intestine has three sections, the duodenum, the jejunum, and the ileum.
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Unformatted text preview: As food travels through the small intestine bile from the liver and gallbladder help digest and absorb fat while enzymes and bicarbonate from the pancreas also helps the digestive process. Material not absorbed by the small intestine moves through a sphincter, which keeps the material from reentering the small intestine, to the large intestine. The colon and rectum are included in the large intestine. The absorption of some water and some vitamins and minerals occurs in the colon. Materials not absorbed by the colon leave the body in waste as feces. The anus, which is attached to the end of the colon, is the external opening of the digestive tract where feces leave the body. (n.d.). Retrieved April 6, 2010, from http://corptrain.phoenix.edu/axia/sci225/sci225-digestivetract.html: http://corptrain.phoenix.edu/axia/sci225/sci225-digestivetract.html Grosvenor, M. B., & Smolin, L. A. (2006). Nutrition: Everyday choices. New Jersey: John Wiley & Sons, Inc....
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