Anatomy and Physiology Answer Key

7 a mastication provides physical break down of the

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Unformatted text preview: ng. (b) To lubricate the food and mix it with saliva to being the process of chemical digestion. 2. The epiglottis prevents food from going into the trachea and instead directs it to the esophagus. This can be inferred from its position and by the fact that i is normally pointed upward during breathing but is more horizontal during swallowing. 3. Tonsils provide immune protection against pharyngeal and upper respiratory tract infections. Stomach and Small Intestine (page 181) The Human Digestive Tract (page 179) 1. Structures as follows: A Mouth and teeth B Salivary glands C Esophagus D Liver E Stomach F Pancreas Region responsible for (a) I - small intestine (b) J - rectum (c) H - colon (d) E - stomach G H I J K L Gall bladder Colon (or large intestine) Small intestine Rectum Appendix Anus each function as follows: (e) F - pancreas (or B) (f) D - liver (g) B - salivary gland Biozone International 2009 Photocopying Prohibited 1. The gut movements move food through the gut by peristalsis and mix the food so it is accessible to digestive enzymes. 2. The stomach is a sac-like organ, lined with folds, which enable considerable expansion of the walls. This allows the stomach to accommodate large volumes of food and serve as a storage organ between meals. The stomach lining is pitted with gastric glands, which secrete acid, mucus, and a precursor of the protein-digesting enzyme, pepsin. The acid activates the precursor and the pepsin begins the process of protein digestion. The mucus protects the stomach lining from the acid and lubricates the food as it is mixed by the muscular stomach walls. Mixing also helps to expose the food in Anatomy and Physiology 1. Cardiac sphincter between esophagus and stomach 30 the stomach to the action of the pepsin. 3. (a) and (b): any two of the following in any order: Site: Stomach Enzyme: pepsin Purpose: Digestion of proteins to polypeptides. Site: Pancreas Enzyme: pancreatic amylase Purpose: Digestion of starch to maltose. Absorption and Transport (page 184) 1. (a) Micelles: Aid the passage of lipids across the...
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This document was uploaded on 01/28/2014.

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