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10 Cards in this Set
- Front
- Back
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active transport |
occurs when energy is needed for a substance to move across a membrane |
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diffusion |
is the movement of a substance across a membrane, due to a difference in concentration, without any help from other molecules |
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endocytosis |
is the type of vesicle transport that moves a substance into the cell |
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exocytosis |
is the type of vesicle transport that moves a substance out of the cell |
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fecilitated diffusion |
diffusion with the help of transport proteins |
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osmosis |
is a special type of diffusion- the diffusion of water molecules across a membrane |
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passive transport |
occurs when substances cross the plasma membrane without any input of energy from the cell |
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sodium-potassium pump |
pumps sodium ions out of the cell and pumps potassium ions into the cell |
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transport protein |
the help that comes from special proteins in the membrane
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vesicle transport |
very large molecules cross the plasma membrane with a different sort of help |
