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Control of Feeding - Anatomy & Physiology (view source)
Revision as of 08:30, 16 July 2008
, 08:30, 16 July 2008no edit summary
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==Phases of Gastric Secretion==
===Cephalic===
*Unconditioned reflex
*Sight, smell, taste of food
*Vagus nerve (CN X)
*[[Endocrine System - Gut - Anatomy & Physiology|Gastrin]] secreted from endocrine cells in pyloric mucosa
*Histamine secreted from paracrine action
*Increase stomach motility by release of hydrochloric acid and pepsinogen
===Gastric===
*Chemical and mechanical receptors in stomach
*Histamine and gastrin released
*Negative feedback loop by sympathomimetic somatostatin released by paracrine method to inhibit gastrin secretion (when pH falls below 3)
===Intestinal===
*Chyme in the duodenum inhibits acid secretion and motility
*Chyme causes release of secretin, [[Endocrine System - Gut - Anatomy & Physiology|GIP]] and [[Endocrine System - Gut - Anatomy & Physiology|CCK]]
===Pancreatic===
*[[Endocrine System - Gut - Anatomy & Physiology|CCK]], secretin and [[Endocrine System - Gut - Anatomy & Physiology|Gastrin]]
*Parasympathetic stimulation during cephalic and gastric phases
*Negative feedback from paracrine sympathomimetics (somatostatin and enkephalins)
===Biliary===
*[[Endocrine System - Gut - Anatomy & Physiology|CCK]] empties [[Gall Bladder - Anatomy & Physiology|gall bladder]]
*Secretin stimulates hydrogencarbonate ions from bile duct
===Small Intestinal===
*Succus entericus
*Secretin, [[Endocrine System - Gut - Anatomy & Physiology|GIP]] and [[Endocrine System - Gut - Anatomy & Physiology|Gastrin]]
*Vagal tone and parasympathomimetic reflex
==Neuroendocrine Regulation of Feeding==
==Neuroendocrine Regulation of Feeding==