Regulation of Intestinal Secretion and Motility

Regulation of Intestinal Secretion and Motility - Digestive...

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Digestive System Regulation of Intestinal Secretion and Motility * The most important regulator of motility and secretion is local reflexes in response to chyme. * Intestinal stretching initiates nerve impulses to the CNS where returning parasympatetic impulses increase motility. * Sympathetic impulses decrease motility. Absorption * The passage of digested nutrients from the GI tract to the blood or lymph. * Occurs by simple diffusion, facilitated diffusion, osmosis, and active transport. * 90% of all absorption takes place in the small intestine. * The other 10% is in the stomach and large intestine. Lipid Absorption (cont) * plasma lipids are insoluble in water,so they must be combined with protein transporters to make them soluble * Lipoprotein - the combination of lipid and protein. * LDL - rich in cholesterol and some phospholipid * functions to transport cholesterol from adipose and muscle tissue to other parts of the body. * High LDL associated with atherosclerosis because cholesterol can be deposited in the
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Regulation of Intestinal Secretion and Motility - Digestive...

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