Chapter 40.2

Chapter 40.2 - 3. Muscularis : the Muscle Layer. 3rd layer...

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FIGURE 40.5 Structure of the human digestive system B)History Of the GI Tract Nearly all structures have the same 4 layers, but there is variation in them 1. Mucosa (deepest) 2. Submucosa 3. Muscularis 4. Serosa (most superficial) FIGURE 40.7 Structure of the human digestive system 1. Mucosa: • innermost layer • Lines the digestive tract • Epithelial Tissue • Thicker in the mouth and anus • Secretes mucus and enzymes Structure of the human digestive system 2. Submucosa • Second layer from the lumen • Contains nerves, blood vessels, and glands Structure of the human digestive system
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Unformatted text preview: 3. Muscularis : the Muscle Layer. 3rd layer from the lumen Most areas: two layers Stomach: 3 layers 1. longitudinal muscles 2. circular muscles 3. oblique muscles (stomach only) Structure of the human digestive system 4. Serosa : Outermost Layer Secretes serous fluid Reduces friction between organs C. Pathway of Food 1. Oral Cavity a. Teeth b. Functions of Oral Cavity 1. mechanical: mastication (chewing) 2. chemical: starches are digested here (amylase) **Food forms a bolus: (a wad of food, mucus, and salivary amylase) C. Pathway of Food...
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This note was uploaded on 03/19/2011 for the course BIO 110 taught by Professor Hemsley during the Spring '11 term at Harper.

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Chapter 40.2 - 3. Muscularis : the Muscle Layer. 3rd layer...

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