20_Digestive_1

20_Digestive_1 - DIGESTIVE SYSTEM Chapter 26 Digestive...

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DIGESTIVE SYSTEM Chapter 26
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Digestive Functions Ingestion Taking food into mouth Mechanical digestion Physical breakdown Mastication: chewing Segmentation: mixing and churning in small intestine Chemical digestion Molecules broken down by enzymes Propulsion Peristalsis : muscular contraction that moves food through GI tract Secretion Production and release of bile, enzymes, etc. Absorption Nutrient transport into blood/lymph vessels Elimination of waste Defecation of feces
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Peristalsis Form of propulsion Involves the contraction and relaxation of the smooth muscle in the alimentary canal It does not break up the food
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Segmentation Local contractions of smooth muscle Involved with mechanical digestion Mixes food with digestive juices
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Histology Mucosa Epithelial lining closest to lumen Ex. Esophageal mucosa is stratified squamous Secretion and absorption Submucosa Vascularized and innervated Muscularis Inner circular and outer longitudinal layers of muscle Segmentation and peristalsis Serosa Visceral peritoneum
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Oral Cavity Structures: Cheeks
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This note was uploaded on 04/06/2011 for the course PDBIO 220 taught by Professor Tomco during the Winter '09 term at BYU.

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20_Digestive_1 - DIGESTIVE SYSTEM Chapter 26 Digestive...

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