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Digestive/Urinary System, Miranda Mancilla, Per. 2 (Location of Digestion…
Digestive/Urinary System, Miranda Mancilla, Per. 2
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Digestive Enzymes
Amylase: produced in the mouth. It helps break down large starch molecules into smaller sugar molecules.
Deoxyribonuclease and Ribonuclease: produced in the pancreas. They are enzymes that break bonds in nucleic acids like DNA and RNA.
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Layers of the GI Tract
Muscularis Propria (Externa)/Smooth Muscle Layer: usually two layers; the inner layer is circular, and the outer layer is longitudinal. These layers of smooth muscle are used for peristalsis (rhythmic waves of contraction), to move food down through the gut
Adventia Layer (Serosa): the outermost layer of loose connective tissue - covered by the visceral peritoneum. Contains blood vessels, lymphatics, and nerves.
Submucosa: a loose connective tissue layer, with larger blood vessels, lymphatics, nerves, and can contain mucous-secreting glands.
Mucosa: a lining of the epithelium, including glandular tissue, an underlying layer of loose connective tissue called the lamina propria, which provides vascular support for the epithelium, and often contains mucosal glands. Products of digestion pass into these capillaries. Lymphoid follicles and plasma cells are also often found here. Finally, a thin double layer of smooth muscle is often present - the muscularis mucosa for local movement of the mucosa.
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