Regulation of digestion

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Regulation of digestion

  1. 1. By: Safana Sadiq
  2. 2. The digestive system is controlled by both: Nerves, and Hormones
  3. 3. Neuronal control of digestion  Autonomic Nervous System SNS PNSDigestive system Digestive system activityactivity
  4. 4. Sympathetic nerves that regulate digestion are:  The greater splanchnic nerves The lumbar splanchnic nerves, and The sacral splanchnic nerves
  5. 5. The parasympathetic nerve that regulates digestion are the vagus nerves.
  6. 6. Hormones that control digestion are:  Gastrin Secretin Cholecystokinin Glucose insulinotropic peptide (GIP)
  7. 7. Effects of gastrin  Stimulates gastric juice secretion Stimulates smooth muscle contraction Relaxation of pyloric sphincter
  8. 8. Effects of secretin  Stimulates bicarbonate secretion Stimulates bile production Inhibits gastric juice secretions and gastric motility
  9. 9. Effects of cholecystokinin  Stimulates bile release Stimulates pancreatic juice secretion Relaxation of the hepatopancreatic ampulla and opening of hepatopancreatic sphincter
  10. 10. Effects of GIP  Stimulates the pancreas to begin release of insulin
  11. 11. The 3 phases of digestive regulation  Cephalic phase Gastric phase Intestinal phase
  12. 12. Cephalic Phase  Neuronal response: Stimuli that arouse digestion relayed to hypothalamus Nerve impulse initiated in vagus nerve Impulse innervates nerve network of GI tract Contraction of sm ms & secretion of gastric juice promoted
  13. 13. Gastric Phase The stimuli that initiates gastric phase includes: Distension of the stomach Low acidity Presence of peptides
  14. 14. Gastric Phase  Neural response: gastric juice secretion & smooth muscle contraction promoted Hormonal response: gastrin production promoted General effect: stomach and small intestine prepare for digestion of chyme , and gastric emptying is promoted
  15. 15. Intestinal Phase  Neural response:  gastric secretion & gastric motility are inhibited  Intestinal secretion, sm ms contraction, bile & pancreatic juice production are promoted
  16. 16. Intestinal Phase  Hormonal response: production of secretin, CCK & GIP is promoted General effects : gastric emptying is retarded to allow adequate time for digestion in the SI. And intestinal digestion and motility are promoted.
  17. 17. Reference http://www.cliffsnotes.com/study_guide/t opicArticleId-277792,articleId-27770.htmlhttp://www.aboutgastro.com/digestive- system/regulation-of-digestive-process

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