ANT 250 II Digestive System & Metabolism M3 Case

ANT 250 II Digestive System & Metabolism M3 Case -...

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ANT 250 II Digestive System & Metabolism Pamela Roberson Digestive System & Metabolism Pamela Roberson TUI University
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ANT 250 II Digestive System & Metabolism Pamela Roberson Digestive System & Metabolism The digestive system is responsible for the mechanical and chemical breakdown of large food molecules into components small enough that these can be absorbed by body cells. This process provides water, nutrients, vitamins and minerals to the body with the movement of food from the mouth, pharynx, esophagus, stomach and intestines, helped by accessory organs like the gallbladder, liver and pancreas (American Medical Association, 2008). The structure and function of the digestive system allows it to effectively achieve a very complex process that involves chewing, digesting and absorbing nutrients with the help of the accessory organs which are indispensable in the digestive process. Digestion Mastication of food, a mechanical activity that starts the digestive process is complemented by the presence of salivary amylase and lingual lipase which starts the chemical process of digestion (AMA, 2008). This produces a soft, pliable mass called a bolus that is swallowed and passed down through the pharynx and esophagus unto the stomach (Crimando, 2005). In the stomach, hydrochloric acid which is secreted by the stomach works in two ways: it kills contaminating microorganisms present in food and provides a low pH environment that allows more efficient action of strong digestive enzymes (National Institutes of Health, 2008).
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