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lipids metabolism_Blei_notes-2

lipids metabolism_Blei_notes-2 - LIPID METABOLISM...

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LIPID METABOLISM Introduction: Lipids (triglycerides) are body’s richest energy source because: 1- They can be more oxidized than carbohydrates. 1 g stored fat = 9.5 kcal 1 g of carbohydrate = 4.2 kcal 2- They can pack in a much more compact way than carbohydrates: 1 g glycogen binds 2 g of water (extremely hydrated). 1 g stored fat = 6 x energy of 1 g of hydrated glycogen. While carbohydrates provide a readily available energy source, lipids function as the principal energy reserve. Storage of Fats: Excess fat is mainly deposited in adipose tissue. Adipose Tissue: tissue composed of fat cells (adipocytes). Fat Cells: a large fat droplet (triglycerides) replaces much of the cytoplasm. Fat Depot: body locations containing large amount of adipose tissue. In non-adipose cells or in plasma, lipids are bound to proteins as lipoproteins. Excess carbohydrates (after no more room is available to store as glycogen) are also converted to fatty acids and stored in adipose tissue.
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