Cell membranes
- Created by: LauraNannini
- Created on: 20-04-20 09:26
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- Topic 6
- Cell membrane
- Phospholipid bi-layer
- The hydrophilic heads face outwards and the hydrophobic tail face eachother
- Fluid mosaic structure
- Chanel proteins
- opening for polar or non-polar molecules
- Cholesterol
- Travels within the bilayer and gives it some stability
- Carrier proteins
- Bind with a specific molecule to carry information to the cell
- Glycoprotein
- Creates long chain polymers of carbohydrats
- Glycolipids
- Creates long chain lipids
- Ficks law = SA x Difference in concentration / length of diffusion path
- Phospholipid bi-layer
- Diffusion
- What effects diffusion
- Size of molecule
- length of diffusion pathway
- Difference in concentration values
- Temperature
- Squamos (flat) cells
- What effects diffusion
- Osmosis
- Net movement of water molecules from a high water potential to a low water potential
- Aquaporins are chanel proteins specific for water
- Co-Transport
- Two substances transported together through the same carrier protein
- Glucose needs sodium ions to help get into the cells
- Protein chanel requires energy to open and close
- Active and passive transport
- Active
- Protein pump
- Endocytosis
- Exocytosis
- Passive
- Simple Diffusion
- Osmosis
- Active
- Cell membrane
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