Membranes Permeability

Cell membranes A boundary between the inside of the cell and the outside environment Three main types of membranes Permeable Semi permeable Non-permeable

Membrane Types Permeable Membrane Semi permeable Membrane Allows the passage of most materials through a membrane Semi permeable Membrane Allows only specific materials through the the membrane Non-permeable Membrane Does not allow any passage through membrane

Plasma Membrane A semi permeable membrane that surrounds animal cells Controls the flow of materials in and out of the cell Nutrients Oxygen Carbon Dioxide Water

Fluid Mosaic Model Composed of a bi-layer of lipids Fluid -> moveable Mosaic -> More than one thing put together These lipids have 2 ends Hydrophillic water liking Hyrdophobic water fearing Hydro means water Phobic means fear Phillic means liking

Plasma Membrane Con’t The two different ends of the lipid molecules line up to form a double layer called a lipid bi-layer This structure allows Easy movement of the membrane Video Clip