PSL301H1 Lecture Notes - Lecture 29: Parotid Gland, Gastric Glands, Gastric Pits

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15 Apr 2019
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PSL301H1 Full Course Notes
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Lecture 29: secretion: secrete 7 l per day into lumen (2x volume blood plasma), requires large surface area. Stomach: folds in gi tube increase surface area 3x, rugae temporary folds increasing sa, gastric pits between rugae lead to gastric glands, lined by secreting glands. Small intestine: villi and crypts of lieberkuhn increase surface area for secretion/absorption, plica (valvulae conniventes) folds of tube. Large intestine: flatter due to less absorption, crypts of lieberkuhn for absorption/secretion. Microvilli: apical projections of intestines for nutrient absorption: increase sa of gi tract, close to epithelial cells. Salivary glands: exocrine tissue producing saliva: sublingual, submandibular, and parotid, saliva for protection, lubrication, taste, digestion of starch, incl. Stomach: exhibits regional specialization - different cells in different areas. Mucus cells: mucus, bicarbonate layer acting as physical barrier of tissue from acid, neutralization. Parietal cells: hcl, intrinsic factor co-transporter atp pump releases protons in exchange for k, cl channels release cl.

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