chp 25 - Chapter 25 Digestive System Functions of the...

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Chapter 25 Digestive System
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Functions of the Digestive System Ingestion – intake of food into body Secretion – addition of chemicals to food Motility – movement of food through GI tract Digestion – mechanical & chemical breakdown of complex molecules to simple ones Absorption – movement of simple molecules from GI tract to blood Excretion – expulsion of unusable material (defecation)
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Stuff Final exam – Wednesday, Dec. 8 1:30 – 4:00 - here 180 pts. ~ ½ new material ~ ½ comprehensive Similar format
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Major divisions Gastrointestinal (GI) tract Single continuous tube – passage of food esophagus stomach sm. intestine colon rectum Accessory structures/organs : aid in functions of dig. system tongue/teeth/salivary glands/pharynx liver/pancreas
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Layers of the GI Tract o Mucosal layer o mucus memb. w/ 3 layers o 1 - epithelial cells & secretory cells (e.g. goblet) o 2 - areolar c.t. (lamina propria) o 3 - thin layer of smooth muscle - causes ridges (rugae, plicae circulares) o Protection, lubrication/ absorption/ secretion Fig. 25.2
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Fig. 25.2 o Submucosal layer o thick layer of areolar c.t. o
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This note was uploaded on 05/28/2011 for the course BIO 331 taught by Professor Dr.burns during the Spring '10 term at N. Colorado.

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chp 25 - Chapter 25 Digestive System Functions of the...

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