Biochemistry: Digestive System Notes Essay

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DIGESTION Cooking vs. Digestive Processes Cooking Processes: * Grilling * Microwaving * Frying * Roasting * Barbeque * Boiling * Steaming * Poaching Digestive Processes: * Ingestion * Propulsion * Mechanical digestion * Chemical digestion * Absorption * Defecation Salivary Digestion SALIVARY DIGESTION Salivary Glands * the salivary glands are a collection of accessory organs surrounding the mouth that secrete a fluid called saliva. * Saliva consists of 99.5 % water and 0.5 % solutes. * medium for dissolving soluble food molecules * solutes include mucus and enzymes * one enzyme (lysozyme) destroys bacteria * second enzyme known as salivary amylase, begins the chemical digestion of starchy foods. * produced by three pairs of salivary glands * parotid , submandibular, and sublingual glands. PAROTID GLANDS * largest salivary glands. * located in front of and slightly below each ear, between the skin of the cheek and the masseter muscle. * secretes a clear, watery fluid that is rich in salivary amylase. SUBMANDIBULAR GLANDS * located along the inner surface of the jaw in the floor of the mouth. * secrete a more viscous fluid than the parotids, owing to the presence of mucus in their secretions. SUBLINGUAL GLANDS * lies in front of the submandibular glands under the tongue. * the fluid they secrete contains an abundance of mucus, and so is thick and stringy. * DIGESTION in the MOUTH: digestion begins in the mouth. Mastication + mixing, form of mechanical digestion * BOLUS: formation of mixing food + mastication. Gastric Digestion Gastric Digestion (Stomach Digestion) is the process of breaking down proteins by the action of the gastric juices in the stomach. The Stomach is located on the left side of the body above the

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