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3 types: 1. diffusion 2. osmosis 3. facilitated diffusion; does not require energy
cells water is lower than outside water; water moves into cell; cells swells, may burst
cytoplasm shrivels and plasma membrane pulls away from the cell wall, occurs when cell loses water in hypertonic solution; only in plant cells
proteins that transport specific substances across a biological membrane; molecule specific; undergoes change in shape;
Protein channel in a cell membrane that allows passage of a specific ion down its concentration gradient.
A protein channel in a cell membrane that opens or closes in response to a particular stimulus.
carrier mediated transport
active transport of materials into cells AGAINST the concentration gradient, high to low
sodium potassium pump
moves sodium out of cell and potassium in, 3 sodium, 2 potassium; in animal cells; creates a positive charge on outside and negative inside
movement of H+ that allows other material to be transported into the cell as the H+ diffuses back across the cell membrane
process by which a cell surrounds and engulfs substances; pinches off from the cell membrane and becomes a membrane-bound organelle; 3 types: pinocytosis, phagocytosis, receptor-mediated
movement of specific molecules into a cell by binding to specifc cites on the cell even though they may not be highly concentrated in teh extra-cellular fluid
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