1. Chapter Twenty Five
Lipid Metabolism

2. Lipids cont’d CO 25.1 © Ron Sanford / CORBIS
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3. Lipids cont’d
Fig. 25.1
In a fatty acid micelle, the hydrophobic chains of the fatty acids and monoacylglycerols are in the interior of the micelle.
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4. Lipids cont’d Fig. 25.2 Chylomicron, a type of lipoprotein
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5. Lipids cont’d
Fig. 25.3
The events that must occur before triacylglycerols can reach the bloodstream through the digestive process.
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6. Lipids cont’d
Fig. 25.4
Structural characteristics of the adipose cell.
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7. Lipids cont’d
Fig. 25.5
Hydrolysis of stored triacylglycerols in adipose tissue is triggered by hormones that stimulate cAMP production with adipose cells.
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8. Lipids cont’d
Fig. 25.6
Fatty acids are transported across the inner mitochondrial membrane in the form of acyl carnitine.
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9. Lipids cont’d
Fig. 25.7
Reactions of the fatty acid spiral for an 18:0 fatty acid.
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10. Lipids cont’d
CC 25.1
The initial stages of exercise are fueled primarily by glucose; in later stages, triacylglycerols become the primary fuel.
Adam G. Sylvester / Photo Researchers
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11. Lipids cont’d
Fig. 25.8
Ketogenesis involves the production of ketone bodies from acetyl CoA.
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12. Lipids cont’d
Fig. 25.9
The pathway for utilization of acetoacetate as a fuel.
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13. Lipids cont’d
Fig
The citrate-malate-pyruvate shuttle system for transferring acetyl CoA from a mitochondrion to the cytosol.
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14. Lipids cont’d Fig. 25.11 Cycles of fatty acid biosynthesis pathways
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15. Lipids cont’d
Table 25.1
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16. Lipids cont’d
Fig
The sequence of cycles needed to produce a C16 fatty acid from acetyl ACP.
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17. Lipids cont’d
Fig
Overview of the biosynthetic pathway for cholesterol synthesis.
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18. Lipids cont’d
CC 25.2
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19. Lipids cont’d
CAG 25.1
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20. Lipids cont’d
Fig
Biosynthesis relationships among steroid hormones.
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