CONTENTS XV 



V. Blood Lipids (continued) 



(4) Cerebrosides '. . . . 361 



(5) Free Fatty Acids 362 



(6) Unsaponifiable Components 362 



a. Cholesterol and Cholesterol Esters 363 



(a) Fatty Acids Combined with Cholesterol 363 



(b) Cholesterol Combined with Protein 363 



b. Hydrocarbons 365 



c. Carotenoids 365 



(a) The Nature of the Carotenoid and Vitamin A Combinations 



in the Blood 366 



d. Fat-soluble Vitamins 368 



(a ) Vitamins A 368 



(b) Vitamins D 369 



(c) Vitamins E (Tocopherols ) 369 



(d) Vitamins K 370 



(7) Lipoproteins in the Blood 370 



a. Types of Lipoprotein 372 



(a) (8-Lipoproteins in Plasma 373 



(b) a-Lipoproteins in Plasma 373 



(c) Elinin 374 



(d) Lipovitellin 374 



1). The Nature of the Lipid- Protein Combinations in Lipoproteins. . 374 



c. Factors Altering the Level of Lipoproteins in Blood 375 



3. Quantitative Relations of Blood Lipids 378 



( 1 ) Normal Values of Blood Lipids in Man 378 



a. Unsaturated Fatty Acids in Blood 378 



b. Free Choline in Blood 379 



(2) Normal Values of Blood Lipids in Various Animal Species 381 



(3) The Lipid Components in Blood Cells 381 



a. Lipids in Erythrocytes 381 



b. Lipids in Leucocytes 386 



(4) Interrelations between Blood Lipids 386 



a. Lipemic Constant 387 



b. Lipemic Index 387 



c. Cholesterol : Lipid Phosphorus Ratio 387 



d. Cholesterol Ester: Total Cholesterol Ratio 389 



4. The Constancy in the Level of Blood Lipids 390 



(1) Normal Variations in the Blood Lipids in Animals of the Same Spe- 



cies 390 



a. Total Lipids 391 



b. Phospholipids 391 



c. Cholesterol 392 



(2) Normal Variations in the Blood Lipids of the Same Individual 392 



5. The Site of Synthesis of Plasma Lipids 393 



6. The Turnover Rate of Plasma Lipids 394 



7. Factors Altering the Concentration of Blood Lipids 395 



