checkpoint- Human Digestion

checkpoint- Human Digestion - duodenum the jejunum and the...

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The sight and smell of food spurs the beginning of the digestive process through the salivary glands. Food is dampened by saliva and chewed by the teeth once it enters the mouth, transforming into a bolus. The bolus then leaves the mouth and travels toward the pharynx, where it is then swallowed (Axis College). It continues then toward into the esophagus, which acts as a tunnel connecting the pharynx to the stomach. After the bolus enters the stomach, it is merged with acid secretions to convert the bolus into a semi-liquid food mass called chyme. The stomach partially digests the food and chyme typically vacates the stomach in two to six hours, depending on the quantity and type of meal that is indigested. The food is then transferred to the small intestine, where the majority of digestion and absorption of nutrients from food occurs. The small intestine is separated into three parts: the
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Unformatted text preview: duodenum, the jejunum, and the ileum. Bile secretions from the liver and gallbladder aid in digesting and absorbing fat from food while the bicarbonate secretions from the pancreas and digestive enzymes help with the digestive process. Any material that is not absorbed by the small intestine then enters into the large intestine through a sphincter, which acts as a barrier to keep food from re-entering the small intestine. The colon and the rectum both occupy the large intestine. Further absorption of water and certain vitamins and minerals takes place in the colon, while the materials that are not absorbed expel from the body as waste through the anus, the outer opening of the digestive tract. Axia College of University of Phoenix. (2010). Human Digestive. Retrieved January 8, 2010, from Axia College, Week Two reading, aXcess, SCI 241—Nutrition Course Web site....
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This note was uploaded on 05/07/2010 for the course ACCT SCI241 taught by Professor Professor during the Spring '10 term at University of Phoenix.

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