Physiology 1021 Lecture Notes - Lecture 1: Uniporter, Facilitated Diffusion, Sucrase

• School: Western University
• Department: Physiology
• Course: Physiology 1021
• Professor: John Ciriello

Document Summary

Saliva is made of water, ions and proteins: parotid gland watery saliva with salivary, submandibular gland thicker saliva with, sublingual gland more mucus than amylase. Secondary peristalsis initiates to move lodged food. Exocrine cells of the stomach: mucus neck cells, secretes mucus and bicarbonate, chief cells, secretes pepsinogen and gastric lipase, parietal cells (oxyntic, secreted intrinsic factor, h+ and cl- (hcl) Gentle mixing of bolus with gastric secretions: 2. More vigorous propulsion towards the pylorus (pyloric pump: 3. Pyloric sphincter is only slightly open: 4. Some chyme moves into the duodenum, most returns to the stomach body for further mixing: enzyme pepsin activated by hcl protein digestion, enzyme lingual lipase activated by hcl fat digestion, enzyme salivary amylase inactivated by hcl carbohydrate digestion inhibited (stops) Jejunum: functions to regulate how fast or slow digestion and therefore absorption occurs, most digestion occurs, most nutrient absorption occurs here (many villi, less nutrient absorption (less villi), but can absorb more nutrients if necessary.