Nutri Sci Lecture 7

Nutri Sci Lecture 7 - Lecture 7 Lipids 2 Some digestion of...

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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 Acts on triglycerides containing short- & medium-chain fatty acids 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 monoglycerides & fatty acids 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
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