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chapter 3 - Lipid transport and distribution 5 types of...

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Lipid transport and distribution •5 types of lipoprotein (continued) •Intermediate-density lipoproteins (IDLs) •Contain smaller amounts of triglycerides •Low-density lipoproteins (LDLs) •Contain mostly cholesterol •High-density lipoproteins (HDLs) •Equal amounts of lipid and protein Lipoprotein lipase •Enzyme that breaks down complex lipids •Found in capillary walls of liver, adipose tissue, skeletal and cardiac muscle •Releases fatty acids and monglycerides Protein Metabolism Amino acid catabolism •If other sources inadequate, mitochondria can break down amino acids •TCA cycle •removal of the amino group (-NH 2 ) •Transamination – attaches removed amino group to a keto acid •Deamination – removes amino group generating NH 4 + •Proteins are an impractical source of ATP production Protein synthesis •Essential amino acids •Cannot be synthesized by the body in adequate supply •Nonessential amino acids •Can be synthesized by the body via amination
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