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Cell Membrane Transport

Outlines the main methods of transport through the cell membrane; simple diffusion, facillitated diffusion, osmosis, active transport, endocytosis and exocytosis

Peter Hopkins

on 16 February 2011

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Transcript of Cell Membrane Transport

PASSIVE ACTIVE Cell Membrane Transport Concentration gradient (high to low) must exist
Small enough
Lipid soluble WITH the concentration gradient
= high to low concentration
NO ATP needed
AGAINST the concentration gradient
= low to high concentration
ATP needed
What determines if a molecule can just diffuse through the cell membrane? Osmosis Diffusion of water from a high water concentration (low solute) to low water (high solute) concentration Active Transport Diffusion Uses a transport protein
Against the concentration gradient (so ATP needed)
Large, lipid insoluble or charged molecules Exocytosis Movement OUT of the cell
Golgi body often involved
Active due to vesicle and cell membrane movement Endocytosis Movement INTO the cell
2 forms; pinocytosis (liquid droplets) and phagocytosis (solids)
Full transcript