Week Two Summer 2010 Short Course: Food and Science: Anatomy and Physiology: "FOOD AND SCIENCE SCHEDULE AND ASSIGNMENTS Barbara E. Goodman, Ph.D. (barb.goodman@usd.edu or 605-677-5158) July 12-16, 2010 Tuesday Ju 13 H..."
The four true hormones in the GI tract are:
1. Gastin - produced by endocrine cells in the stomach. It stimulates acid secretion, and is inhibited by acid in stomach.
2. Cholecystokinin (CCK) - produced by endocrine cells in small intestine. It stimulates pancreatic enzymes and bicarbonate secretion and stimulates gallbladder contraction and release of bile.
3. Secretin - produced by endocrine cells in small intestine. It stimulates pancreatic secretion of bicarbonate, inhibits gastric emptying and increases biliary secretion of bicarbonate.
4. Gastric Inhibitory Peptide (GIP) - produced by endocrine cells in small intestine. It inhibits gastric motality and secretion and stimulates secretion of insulin from pancreatic islets.
Defecation reflex is one type of reflex. If the rectum is distended by feces or an increase in pressure, the defecation reflex is initiated. The internal anal sphincter relaxes and the external anal sphincter constricts. If both are relaxed, defecation can occur.
No comments:
Post a Comment