April 16 - April 16, 2008 Chemical digestion degradation of...

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April 16, 2008 Chemical digestion – degradation of large food substances into smaller monomers (building blocks) using enzymes Regulating chemical digestion Neuronal regulation Autonomic nervous system controls digestion Parasympathetic nervous system – activation will cause increased release of digestive juices (which contain the digestive enzymes), increase motility of the GI tract Activation of the sympathetic nervous system – decrease release of digestive juices and decrease in motility of the GI tract Hormonal regulation of digestion – 3 hormones Gastrin – increase release of gastric juice and increase stomach emptying (chyme is delivered to the duodenum) Enteroendocrine cells in the wall of the small intestine secrete 2 hormones Cholecystokinin (CCK) Secretin Function of CCK 1. Stimulate contraction of the gall bladder to release bile for fat digestion 2. Stimulates the secretion of the pancreatic enzymes into pancreatic juice 3. Causes relaxation of the hepatopancreatic sphincter to allow delivery of the pancreatic juice and bile by the hepatopancreatic duct Secretin function 1. Stimulates bile synthesis by the liver
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April 16 - April 16, 2008 Chemical digestion degradation of...

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