Physiology 2130 Lecture Notes - Lecture 8: Pancreatic Islets, Dipeptide, Brush Border
28 Mar 2017
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Secretion secrete into lumen exocrine (enzyme) or blood vessel endocrine (hormone) Digestion chemical (enzymes breaking down macromolecules) or mechanical. Motility propels food through each segment of the tract; can be mechanical digestion. Absorption movement of macronutrients into cells of digestive tract then blood. Accessory organs helps digestion but doesn"t touch the food. Common bile duct brings the bile to the small intestine. Motility: mastication in mouth and peristalsis in esophagus. Mechanical break up of the food (mastication) and also some chemical digestion. Saliva is secreted in the mouth by 3 exocrine glands lingual lipase in babies helps digest fats. Parotid gland high in water and salivary amylase (enzyme to help digest carbohydrates) Submandibular gland mix of water and mucus, moderate levels of amylase. Sublingual gland high in mucus and low in amylase; active at rest. Voluntary mastication/chewing when you choose to swallow. Pharyngeal closes nasal cavity and trachea, the food cannot stop going down because of neurons.
