cell membrane
- Created by: official-rxhel
- Created on: 20-11-20 11:26
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- cell membrane
- cell membaranes acts as a barrier annd controls what enters and exits (its selectively permable)
- In 1972 the "fluid mosiac model" was suggested to describe the plasma membrane
- fluid : movement of phospholipid, flexible structure
- mosiac: different companantes vary in shape size pattern like mosiac tiles
- In 1972 the "fluid mosiac model" was suggested to describe the plasma membrane
- phospholipid bilayer
- Hydrophillic phospate heads - love water
- Hydrophobic tails - hate water
- it keeps the membrane fluid but stable
- permability of membrane
- small non polar molecules diffuse rapidly
- small polar molecules diffuse at slower rates
- ions cant freely diffuse as they have a charge
- large particles cant freely diffuse because its too big
- its semi permable
- Transport protiens
- intrinstic or intergral
- spans the whole layer (from the outer to inner layer)
- it transports stuff from one end to the other
- this is where the cell is selectively permable as only specific substrates can pass through
- it transports stuff from one end to the other
- spans the whole layer (from the outer to inner layer)
- extrisntic or periphal
- only goes through halfway (could be inner or outer)
- cell signalling with the glycoprotiens
- only goes through halfway (could be inner or outer)
- intrinstic or intergral
- Cholesterol
- its embedded into the phopholipids (binds to the tails) and adds structural stability to the membrane
- hydrophobic - hates water
- more cholosterol -> less fluid-> less permable
- its embedded into the phopholipids (binds to the tails) and adds structural stability to the membrane
- Glycolipid
- Glycoprotien
- carbohydrates bonded to protien
- the carbohydrates acts as a receptor for cell signlling or hormones
- carbohydrates bonded to protien
- carbohydrates bonded to lipids
- the carbohydrates acts as a receptor for cell signlling or hormones
- Glycoprotien
- membrane fluid
- its neccasry for diffusion of substances through the membrane
- cell membaranes acts as a barrier annd controls what enters and exits (its selectively permable)
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