Cell membrane
- Created by: katiestanton4
- Created on: 14-12-13 22:16
View mindmap
- CELL MEMBRANE
- otherwise known as plasma membrane... OCR prefer it
- under light microscope it appears as a thin line.
- under electron microscope it appears as a double line.
- Fluid mosaic model
- Glycoprotein: identifies the cell as self material
- phosphopilid bilayer, arehydrophilic so love water. they are the phosphate heads
- hydrophobic fatty acid tails- hate water
- proteins
- carbohydrates
- cholesterol
- Functions:
- Offer support
- insulates nerves
- controls what enters and leaves the cell
- is partially permeable
- Found in all cells
- delicate lipid and protein skin around cytoplasm
- Components are free to move in the fluid mosaic model
- high cholesterol affects the cell membrane
- cholesterol is present in the membrane
- more cholesterol makes the cell membrane less likely to move and more rigid
- Factors that affect permeability of cell membrane
- heat
- ethanol- dissolves lipid components of cell membrane- full of holes
- pH
- pH and heat make the membranes proteins denature
- heat
- pH and heat make the membranes proteins denature
- Partically permeable so only some substances pass through e.g. oxygen, carbon dioxide
- the partically permeable call membrane allows osmosis to take place
- Osmosis is movement of water from high to low water potential through a pertailly permeable membrane
Comments
No comments have yet been made