| NOUN | process | passive transport | transport of a substance across a cell membrane by diffusion |
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| Meaning | transport of a substance across a cell membrane by diffusion; expenditure of energy is not required. | |
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| Broader | transport | An exchange of molecules (and their kinetic energy and momentum) across the boundary between adjacent layers of a fluid or across cell membranes |
| Catalan | transport passiu | |
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