24 - Lipid Metabolism, Part 1

24 - Lipid Metabolism, Part 1 - Lipid Metabolism. Part I...

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Lipid Metabolism. Part I Lipoproteins Digestion of Lipids Transport of lipoproteins Bile acids Learning Objectives Functions of Lipids Endocytosis
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Functions of Lipids Components of biomembranes Energy reserves: Camel’s hump Hibernating mammals Migrating birds Energy source: fatty acids are more reduced (have less oxygen atoms) than carbohydrates and, therefore, conserve more energy. Hormones
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Digestion, Absorption, Storage, and Mobilization of Lipids Fig. 20-7
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Fig. 20-1 Bile Acids Peristaltic movements of the intestine and emulsifying action of bile acids greatly increase digestion of lipids. Bile acids (bile salts) are amphipathic detergent-like cholesterol derivatives that solubilize fat globules Bile salts Stomach
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Absorption of Lipids Lipid digestion produces mixture of fatty acids, mono-, and diacylglycerols. Bile acids and nonpolar products of lipid digestion form micelles. Cells lining the small intestine absorb the mixture.
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Triacylglycerols constitute ~ 90 % of dietary lipid Triacylglycerols are water-insoluble. Digestive
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24 - Lipid Metabolism, Part 1 - Lipid Metabolism. Part I...

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