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Transcript
Cell Membrane Cell Membrane (Lipid Bilayer, Plasma Membrane) • Function – Regulates what enters and leaves the cell and also provides protection and support. Cell Membrane (Lipid Bilayer, Plasma Membrane) • Structure – A double layered sheet. Gives the cell membrane a tough, flexible structure. Cell Membrane (Lipid Bilayer, Plasma Membrane) • Selectively Permeable – Allows only certain substances to pass through. Passive Transport • Movement of molecules across a membrane that does NOT require energy. • Passive Transport Diffusion – Movement of molecules from an area of high concentration to an area of low concentration. Passive Transport • Osmosis – Diffusion of water. Active Transport • Movement of molecules across a membrane that DOES require energy.