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digestive/urinary system (major functions (propulsion and segmentation…
digestive/urinary system
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layers of the GI Tract
mucosa
made up of simple columnar epithelium:in the stomach and samll intestine the mucosal layer is folded to have secretory glands.
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major functions
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digestion
process of breaking down food by mechanical and enzymatic action in the alimentary canal into substances that can be used in the body
ingestion
process of taking food,drinks, or another substance into the body
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