ANAT 261 Lecture Notes - Schwann Cell, Microvillus, Silver Nitrate

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The digestive system consists of the digestive tract and associated glands: The digestive tract is composed of: oral cavity, pharinge (we won"t look at this, esophagus, stomach, small and large intestines, rectum (we won"t look at this) The associated glands are: the salivary glands, liver, pancreas. The function of the system is obtain from ingested foor metabolites and energy required for growth. Before being stored or used as energy, food must be broken down into small molecules by digestion. These molecules are then easily absorbed through the lining of the digestive tract. The first step of digestion occurs in the mouth, where food is moistened by saliva and ground by teeth. The oral cavity is lined with a nonkeratinized stratified squamous epithelium and underneath is a lamina propria made of loose ct. The lamina propria is continuous with the submucosa, which is a layer of dense irreg. The lips transition from a keratinized (outside) to nonkeratinized (inside) epithelium.