3,326
edits
Changes
Control of Feeding - Anatomy & Physiology (view source)
Revision as of 10:11, 23 July 2008
, 10:11, 23 July 2008→Phases of Gastric Secretion
Line 130:
Line 130:
*Sight, smell, taste of food
*Sight, smell, taste of food
−*Vagus nerve (CN X)
+*Vagus nerve ([[Nervous System - CNS - Anatomy & Physiology#Innervation - Cranial Nerves|CN X]])
**Parasympathetic fibres
**Parasympathetic fibres
**Synapse in submucosal plexus
**Synapse in submucosal plexus
Line 150:
Line 150:
===Gastric===
===Gastric===
−*Chemical and mechanical receptors in stomach respond to stretch and chemical stimulation
+*Chemical and mechanical receptors in [[Forestomach - Anatomy & Physiology|stomach]] respond to stretch and chemical stimulation
*Increase in pH of gastric contents
*Increase in pH of gastric contents
Line 156:
Line 156:
*Response to undigested materials, especially proteins
*Response to undigested materials, especially proteins
−*Histamine and gastrin released
+*Histamine and [[Endocrine System - Gut - Anatomy & Physiology|gastrin]] released
−*Negative feedback loop by sympathomimetic somatostatin released by paracrine method to inhibit gastrin secretion (when pH falls below 3)
+*Negative feedback loop by sympathomimetic somatostatin released by paracrine method to inhibit [[Endocrine System - Gut - Anatomy & Physiology|gastrin]] secretion (when pH falls below 3)
*Submucosal and myenteric plexuses activated in vagus reflex arcs
*Submucosal and myenteric plexuses activated in vagus reflex arcs
Line 172:
Line 172:
===Intestinal===
===Intestinal===
−*Chyme in the [[Duodenum - Anatomy & Physiology|duodenum]] inhibits acid secretion and motility by decreasing the stomach distension and increasing the stretch of the [[Duodenum - Anatomy & Physiology|duodenum]] leading to the enterogastric reflex
+*Chyme in the [[Duodenum - Anatomy & Physiology|duodenum]] inhibits acid secretion and motility by decreasing the [[Forestomach - Anatomy & Physiology|stomach]] distension and increasing the stretch of the [[Duodenum - Anatomy & Physiology|duodenum]] leading to the enterogastric reflex
*A drop in pH below 4.5 causes release of secretin which inhibits parietal and chief cells and stimulate buffer release from the [[Pancreas - Anatomy & Physiology|pancreas]]
*A drop in pH below 4.5 causes release of secretin which inhibits parietal and chief cells and stimulate buffer release from the [[Pancreas - Anatomy & Physiology|pancreas]]