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    • Health Impact
      • Too much saturated fats
        • Leads to a build up of low density lipoproteins (LDL)
          • Fatty material (atheroma) builds up in the arteries
            • The build up will restrict blood flow and means less oxygen will reach the heart!
              • If the artery becomes completely bloocked it will lead to a heart attack
      • Lots of unsaturated fats
        • Leads to large amounts of High Density Lipoproteins (HDL)  This is good cholesterol.
          • HDL carries harmful fats to the liver where it is digested
            • This lowers the risk of heart disease
    • Properties
      • Unsaturated lipids have double Carbon-Carbon bods
        • Mono- unsaturated has only one double Carbon-Carbon bond
        • Polyunsaturated lipids have more than one double bond
        • Unsaturated lipids are liquid at room temperature
          • This is because the double bond causes a kink in the chain, therefore the molecules cannot align properly
        • Saturated lipids have only single bonds
          • They are solid at room temperature
            • Therefore they are great for storage in plants and animals
          • Saturated fats cause straight chains, the molecules can align in a uniformly
          • They form a straight zig zag arrangement
    • Phospholips- a special kind of lipid
      • Mostly lipids are insoluble in water, but a phospholipid has lots of oxygen on one part of the molecul
        • The part with lots of oxygen is polar and it interact with water. It is said to have a hydrophillic head
        • It has a non-polar tail, this is the part of the molecule that doesn't interact with water because of the fatty acid tail don't have oxygen. It is hydrophobic
      • Roles of phospholipid
        • Biological membraes
        • Electrical insulation
    • Triglycerides
      • Triglycerides form from a condensation reaction
        • 3 fatty acids join one glycerol molecule. 3 molecules of water are lost
        • An ester bond forms
      • Roles of triglycerides
        • Energy reserves- lipids contain more C-H bonds than carbohydrates
        • Thermal insulation- protects against heat loss and gain as lipids are stored under the skin
        • Protection of delicat organs- fat is stored arond the organs and helps protect from physical damage
        • Metabolic water- water released during chemical reactions. Think Cammels
    • Waxes
      • Lipids which melt above 45 degrees
      • Roles
        • Waterproofing
          • Plants waxy cuticle prevents water loss
          • Exoskeleton in insects


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