Nutri Sci Lecture 7

Nutri Sci Lecture 7 - Lecture 7: Lipids 2 2/10/10 Some...

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Lecture 7: Lipids 2 2/10/10 Some digestion of fat occurs in the stomach 1. Gastric lipase (lipase: breaks apart lipids) Activated by an acidic environment Bile helps in fat digestion and absorption Made in liver, stored in and secreted by gallbladder Greenish fluid containing minerals cholesterol (2/3 is what we make=endogenous, 1/3 dietary=exogenous) phospholipids (e.g. lecithin): aid in fat emulsification bile salts: derived from cholesterol; also aid in fat emulsification bile pigments Fat digestion in lumen of small intestine Pancreatic Lipase hydrolyzes dietary fats form micelles diffuse into the cells of small Intestine Absorption of fatty acids a. Short - and medium-chain fatty acids (< 12 carbons) Are water-soluble Enter the portal vein to the liver b. Long -chain fatty acids Not water-soluble re-form into triglycerides in intestinal cells Converted into chylomicrons Enter the lymphatic system
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ALL fatty acids require adequate protein for transport Re-assembly of lipids into chylomicrons for release into blood and lymph Lymph system carries dietary fat from GI tract to vascular system
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Nutri Sci Lecture 7 - Lecture 7: Lipids 2 2/10/10 Some...

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