Assignment Physiology Presentation

Assignment Physiology Presentation - Digestion, Respiration...

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Unformatted text preview: Digestion, Respiration and Circulation Physiology Presentation Tabitha Neufind HCA/220 Rebecca Riznyk Digestion System The digestive track consists of 6 main parts; the oral cavity, esophagus, stomach, small intestine, large intestine, and rectum. Digestion starts in the oral cavity and is finished when stool is eliminated from the body through the anus. The Oral Cavity the Start of Digestion Teeth macerate food into smaller pieces. Mixes with saliva produced by the salivary glands. The saliva contains enzymes which start to break down starches. Saliva mixes with the food to assist with the movement down the esophagus (Taylor- Butler, 2008, p.14). Muscles around the esophagus contract and relax in a wave. This moves the food down into the stomach. The Stomach The stomach is made of strong muscles (Taylor-Butler, 2008, p. 16). Can hold approximately three pints. When food enters into the stomach the muscles squeeze and continue to mash the food into even smaller pieces. The lining of the stomach contains cells that release gastric juice. The gastric juice contains enzymes and hydrochloric acid. The stomach is lined with a mucus that protects the stomach from the acid. Gastric juice starts the breakdown of proteins. Food stays in the stomach anywhere from two to five hours. Once food is mixed in the stomach with the gastric juices it is called chyme (kime). The chyme then moves from the stomach into the duodenum which is the first part of the small intestine. Its Small, but Boy It Sure Is Long The small intestine is about 1 to 2 inches wide. Food is broken down even further in the small intestine. The majority of food is absorbed in the small intestine and then enters into the bloodstream. Organs such as your pancreases, gallbladder, and liver help for this digestion to happen (Taylor-Butler,...
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This note was uploaded on 11/27/2010 for the course HCA 220 220 taught by Professor Sumpter during the Spring '10 term at University of Phoenix.

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Assignment Physiology Presentation - Digestion, Respiration...

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