Functions of secretion 1. Moisten food 2. Begin chemical digestion(a amylase, tE 粉酶) 3. Adjust appetite 4. Bacteriostatic action(抑菌作用 ( bacteriolysis,溶菌素)
6 Functions of secretion 1. Moisten food 2. Begin chemical digestion (a amylase, 淀 粉酶) 3. Adjust appetite 4. Bacteriostatic action （抑菌作用) (bacteriolysin, 溶菌素)
Control of salivary secretion Fear reflexes Nausea Sleep Secretion rate depends Tired Dehydration entirely on neural control Higher centers brai both parasympathetic(Ach, M receptor)(water Taste secretion) Salivatory nuclei Chew ing and sympathetIc (na,B srel-7G receptor)(enzyme) SNS (CAMP) PNS(P3) lead to increased Secretion secretion Vasodilation Acinus Duct Cell contraction Metabo|sm↑ Sal vary gland
7 Control of salivary secretion Secretion rate depends entirely on neural control both parasympathetic (Ach, M receptor) (water secretion) and sympathetic (NA, β receptor) (enzyme) lead to increased secretion Fear Sleep Tired Dehydration Nausea Secretion Vasodilation Cell contraction Metabolism SNS (cAMP) PNS(IP3)
I. Gastricsecretion
8 II. Gastric secretion
Functions of stomachy Temporary store of ingested material Dissolve food particles and initiate digestive process Control delivery of contents to small intestine Sterilise ingested material Produce intrinsic factor (vitamin B12 absorption)
9 • Temporary store of ingested material • Dissolve food particles and initiate digestive process • Control delivery of contents to small intestine • Sterilise ingested material • Produce intrinsic factor (Vitamin B12 absorption) Functions of Stomach
Oesophaqus Lower Oesophageal Sphincter Fundus Duodenum Pylorus Body 10 Antrum
10 Oesophagus Lower Oesophageal Sphincter Fundus Body Antrum Duodenum Pylorus