Lipids
- Created by: victoria123!!!
- Created on: 29-03-16 13:06
View mindmap
- LIPIDS
- 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
- The build up will restrict blood flow and means less oxygen will reach the heart!
- Fatty material (atheroma) builds up in the arteries
- Leads to a build up of low density lipoproteins (LDL)
- 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
- HDL carries harmful fats to the liver where it is digested
- Leads to large amounts of High Density Lipoproteins (HDL) This is good cholesterol.
- Too much saturated fats
- 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
- They are solid at room temperature
- Unsaturated lipids have double Carbon-Carbon bods
- 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
- Mostly lipids are insoluble in water, but a phospholipid has lots of oxygen on one part of the molecul
- 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
- Triglycerides form from a condensation reaction
- Waxes
- Lipids which melt above 45 degrees
- Roles
- Waterproofing
- Plants waxy cuticle prevents water loss
- Exoskeleton in insects
- Waterproofing
- Health Impact
Comments
No comments have yet been made