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Transcript
The plasma (Cell) membrane • Cell Membrane (Plasma Membrane): forms a boundary between a cell and the outside environment. Maintaining balance • Cells must keep a balance inside the cell and be able to eliminate wastes. • The plasma membrane does this by controlling the passage of materials into and out of the cell. Maintaining balance • Selective permeability means that the plasma membrane is able to allow some materials to pass while keeping others out. Structure • The cell membrane is a phospholipid bilayer. • It contains two layers of several phospholipids/ lipid molecules with proteins embedded. • A phospholipid is composed of three basic parts Phospholipid Cell Membrane-fluid mosaic model The plasma (cell) membrane The lipid bilayer • The phosphate group is attracted to water (hydrophilic ).This means polar. • Fatty acid tails don’t like water and are repelled by water (hydrophobic ). This means non-polar. The membrane proteins • The proteins determine which particles can pass and act as markers and receptors to signal molecules where they can go or what they can do.
