BIOS 256 Midterm Study Guide.docx - \u2605 Layers of Digestive Tract \u25cb Mucosa:Most Deep Layer Contact with Stomach Contents Produces Secretions \u25a0

BIOS 256 Midterm Study Guide.docx - u2605 Layers of...

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Layers of Digestive Tract Mucosa:Most Deep Layer. Contact with Stomach Contents. Produces Secretions. Epithelial Layer: Epithelium in the mouth, pharynx, esophagus, and anal canl is composed of nonkeritanized stratified squamous epithelium The lining of the stomach and intestines are composed of simple columnar epithelium Enteroendocrine cells found in this layer secrete hormones Lamina Propria: Composed of areolar connective tissue containing blood and lymph vessels Supports epithelial layer and binds it to the muscularis layer. MALT (Mucosa-associated lymphatic tissue): Lymphatic nodules contain immune system cells that protect against disease Muscularis Mucosae: Thin layer of smooth muscle Throws mucus membrane of the stomach and small intestines into folds to improve surface area for digestion and absorption. Submucosa: Composed of areolar connective tissue Contains blood and lymphatic vessels that receive absorbed food molecules.

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