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Transcript
CELL TRANSPORT The Cell Membrane is selectively permeable. Some substances can pass through it and others cannot. TWO METHODS Passive Transport • Diffusion • Osmosis • Facilitated Diffusion DIFFUSION • Process by which molecules tend to move from an area of higher concentration to an area of lower concentration. OSMOSIS • The diffusion of water molecules through a selectively permeable membrane. Cells can not function properly without adequate water Facilitated Diffusion Some material just can’t get through the membrane without a little help. Carrier molecules are happy to lend a hand. This does not use any energy. FYI only Active Transport •Endocytosis •Excocytosis Endocytosis The process of bringing a large substance into the cell in a vesicle. Exocytosis The process of large particles leaving a cell in a vesicle.
