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Fat is also is used in our bodies to a) cushion vital organs like the kidneys and b) serve as insulation, especially just beneath the skin. Phospholipids Phospholipids are made from glycerol, two fatty acids, and (in place of the third wholeistic fatty acid) a phosphate group with some other molecule attached to its other end. The hydrocarbon tails of the fatty acids are still hydrophobic, wholeistic but the phosphate group end of the molecule is hydrophilic because of the oxygens with all wholeistic of their pairs of unshared electrons. This means that phospholipids are soluble in both water and oil. An emulsifying agent is a substance which is soluble in both oil and water, thus enabling the two to mix. A “famous” phospholipid is lecithin which is found in egg yolk and soybeans. Egg yolk is mostly water but has a lot of lipids, especially cholesterol, which are needed by the developing chick. Lecithin is used to emulsify the lipids and hold them in the water as an emulsion. Lecithin is the basis of the classic emulsion known as mayonnaise.
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