Ch 15 quiz - 1 When food is consumed the site where...

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1. When food is consumed the site where digestion begins is in the: A. Mouth B. Stomach C. Small Intestine D. Large Intestine Digestion begins in the mouth. Both chewing, which breaks food particles down into smaller particles, and the salivary enzyme amylase, which begins the chemical digestion of starch, contribute to the process of digestion. Digestion continues in the stomach, but most chemical digestion actually takes place in the small intestines. Reference: [See p. 530; see also Fig. 15-3]. 2. The liver produces _______ which aids in the digestion of _______. A. Amylase; starch B. Pepsin; protein C. Hydrochloric acid; proteins D. Bile; lipids The liver produces bile which aids in the digestin of lipids by emulsifying large lipid droplets into smaller lipid droplets. Reference: [See p. 530-531 & p. 537; 3. The gall bladder: A. Synthesizes bile B. Stores bile C. Is stimulated to contract by the hormone CCk D. Answer is D. Dilute bile is secreted by the liver and shunted into the gall bladder where it becomes concentrated and is stored until needed. The signal for gall bladder contraction is the intestinal hormone CCK (cholecystokinin). Secretion of CCK from intestinal epithelium into the blood occurs upon arrival of the fatty meal particles in the small intestine. Bile is synthesized by the liver cells and is released into the small bile ducts, which lead out of the liver. Bile is stored in the gallbladder, Reference: [See pp. 532; see also Fig. 15-4]. 4. The luminal surface of intestinal epithelial cells is covered with small projections called: A. Villi B. Microvilli C. Lacteals D. Mucosa Microvilli are projections of the membrane of intestinal epithelial cells. The mucosa is composed of the epithelial layer, its lamina propria, and the muscularis mucosa. Projections of the mucosa into the lumen
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are called villi. Lacteals are lymphatic vessels found within each villus (singular of villi). Reference: 4. Which of the following statements regarding digestion and absorption of carbohydrates is true? A. Carb digestion begins in the mouth. B. Polysaccharides are broken down to monosaccharides by amylase C. Disaccharides are actively transported across the epithelium of the small intestine D. All of the above E. None of the above Carbohydrate and starch digestion begins in the mouth with the action of the salivary enzyme amylase. Amylase breaks polysaccharides down to short-branched chains of glucose molecules (oligosaccharides). More complete digestion of polysaccharides to disaccharides and mono saccharides takes place in the small intestine by the action of pancreatic amylase and other enzymes. It is the monosaccharides that are actively transported across the intestinal epithelial cells, not disaccharides. Reference: [See pp. 536-537].
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This note was uploaded on 05/13/2010 for the course BIOL-N 217 taught by Professor Clark during the Fall '09 term at IUPUI.

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Ch 15 quiz - 1 When food is consumed the site where...

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