Cell Membranes
- Created by: Amy Kirkness
- Created on: 16-11-12 01:27
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- Cell Membranes
- ie. plasma membrane
- allows diffusion
- stops destruction of cells
- ensures appropriate susbstances are allowed in
- semi-permeable
- allows certain substances in but not others
- carries important information from nerves & hormones & in between cells
- has receptors (liganers) that send certain signals to the cell
- bilayer
- phospholipids
- cell surrounded by watery environment
- hydrophilic heads in contact with the water
- phospholipids
- hydrophilic heads in contact with the water
- proteins float with membrane & some rest against the surface & some penetrate right through phospholipids
- Transport Proteins
- penetrate membrane
- form channels within for some substances move through
- Receptor Proteins
- bind substances like hormones to bring about changes in cell's activities
- carries out different functions
- Adhesion Proteins
- allow cells to join together
- Recognition Proteins
- attached to carbohydrate molecules to form antigens with enable the immune system to identify foreign cells in the body
- Carbohydrates
- on the outer surface
- connected to proteins
- Cholesterol Molecules
- complex lipids
- give membrane some water resistance decreasing permeability to small water soluble molecules
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