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Erstellt / Aktualisiert 08.01.2020 / 13.01.2020
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Fenster schliessen

Functions of trilgycerides (5)

Blubber for bouyancy (fat weighs les than muscle)

Insulation

Protector of organs & shock absorber

Energy source

Water source 

 

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Why does body store triglycerides rather than carbohydrates (glucose)? (2 reasons)

Triglyceride metabolism yields (wins) more ATP than glucose

Adipose tissue (lipid sotrage) can expand exponentially whereas carbohydrate storage (liver) has finite size

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Differences and similarities of diglycerides and phospolipids (number of fatty acid chains, hydrophilic region, hydrophobic region)

Diglycerides: two fatty acid chains, no hydrophilic region, hydrophilic region

Phospholipids: two fatty acid chains, hydrophilic and hydrophobic regions

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Phospholipids (twi things that make them useful)

Unsaturated fatty acid chain (kink) makes hydrophobic region flexible

Hydrophilic head keeps the membrane together and protects them from bigger and hydrophobic molecules

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Sterols (structure 1, properties 3)

Tetra-ring structure 

Grouped in lipids (same properties)

Non soluble in polar solvents (water)

Soluble in non polar (organic) solvents (ether)

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Cholesterol (function (3), properties (2) -> (1))

Hormone synthesis, vitamin d synthesis, structural support in membranes

Extremely hydrophobic and insoluble in polar solvents 

Packed into apolipoprotein (lipid,cholesterol,protein bundle)

 

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What happens if you have too much cholesterol? (3)

Heart disease

Atherosclerosis

Inflexible membranes 

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HDL (definition, function (2), how much cholesterol do they contain?)

Apolipoprotein (lipids,cholesterol,protein) -> High density of cholesterol

Transportation of fat (cholesterol, phospholipids, triglycerides) & cholesterol from cells to liver for excretion or reuse