ANA300Y1 Lecture Notes - Lecture 38: Enteric Nervous System, Sympathetic Nervous System, Stomach
Document Summary
Gastrin, cholecystokinin (cck), secretin, and glucose-dependent insulotropic peptide (gip) Cck is released at duodenum and jejunum and is triggered by presence of fat or protein digestion products in duodenum functions to inhibit gastric secretion in stomach and motility. Opposite to gastrin but enhances secretion of pancreatic enzymes, bile secretion of liver and stimulates gall bladder contraction. Secretin released in duodenum and jejunum and trigger is presence of acid in duodenum. Actions are like cck, try to inhibit gastrin release and do things downstream of that. In given region of gi tract region can respond to stimuli arising from that region and is acting on that region or that region of gi tract can respond to stimulus from some remote region. Gi system, called cephalic phase of gi control cephalic since involve brain, this requires neural input thus requires long pathway, not the short one cephalic phase (see or smell food), stimuli originate in head, release saliva or stomach acid.
