The 4 hormones are gastrin, secretin, CCK, and GIP. Gastrin stimulates the perietal cells to secrete HCl in intrinsic factor. Secretin neutralized acid below the stomach by stimulating the pancreas to release carbonate ions. CCK is related fat digestion by stimulating gall bladder to release bile. GIP mainly causes insulin release from the pancreas.
One neuromuscular reflex is the gastrocolic reflex causes the urge to defecate following a meal. The enterogastric reflex shuts off the gastrin release based on the pH levels in the stomach and duodenum. The colonoileal reflex inhibits the urge to empty the colon.
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