FNU 203 Lecture Notes - Lecture 5: Pylorus, Ileocecal Valve, Brush Border
1 Nov 2017
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Document Summary
Digestive system- movement of nutrients into the body. Endocrine system- secretes hormones to assist with food intake and function of digestive organs. Nervous system- aids in digestion by sending nerve signals that control passage of food through the digestive system. Urinary, respiratory, integumentary system- removal of metabolic waste. Gi tract: mouth, pharynx, esophagus, stomach, small and large intestines. Dysphagia deals with difficulty swallowing, usually because of paralysis. Epiglottis- blocks off the pharynx to prevent food from getting into the airways. Stomach- has the (lower) esophageal sphincter at the top: malfunction of the les causes acid reflux. Taking too much acid reducer can cause malabsorption of minerals that require acidic ph, like b12, which is important for nerve support. Cells are replaced every 3-4 days because of work and acidity: mixes and churns the bolus into chyme. Pepsinogen- inactive form of pepsin, produced by chief cells: when pepsinogen is activated to pepsin, it begins to breakdown proteins.
