Lect 4, text 96-98 & 240 - 1 Digestion Three...

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Digestion Three Subdivisions of Digestion: 1. Cephalic Phase: response of CNS to sensory stimuli (smell, sight, and taste) that occurs before food enters GI tract a. Characterized by increased GI motility and release of GI secretions 2. Gastric Phase: phase of digestion stimulated by arrival of food into stomach a. Characterized by increased GI motility and release of GI secretions 3. Intestinal Phase: phase of digestion when chyme enters small intestine a. Characterized by both a decrease in gastric motility and secretion of gastric juice The Oral Cavity and the Esophagus: - Mastication: chewing, when digestion actually begins - Presence of food stimulates salivary glands to release saliva; o Saliva: consists of water, mucus, digestive enzymes, and antibacterial agents that moisten the food and makes it easier to swallow - Lingual Lipase: enzyme that begins to hydrolyze fatty acids from glycerol molecules o Accompanies bolus into stomach - Taste Buds: detect four basic tastes—salty, sour, sweet, and bitter
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This note was uploaded on 02/23/2008 for the course NS 1150 taught by Professor Levitsky during the Fall '05 term at Cornell University (Engineering School).

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Lect 4, text 96-98 & 240 - 1 Digestion Three...

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