| Term | Definition |
|---|
| Passive Transport | Down a gradient, no ATP required |
| Simple Diffusion | no membrane required |
| Facilitated Diffusion | molecules diffuse through membrane channels |
| Osmosis | water diffuses across a membrane |
| Active Transport | Against a gradient, ATP required |
| Contractile Vacuole | in freshwater Protista, pumps out excess water that has diffused inward because the cell lives in a hypotonic environment |
| Exocytosis | in nerve cells occurs as vesicles release neurotransmitters into a synapse |
| Pinocytosis | cell drinking, the uptake of large, dissolved particles; plasma membrane envelops the particles and encloses them in a vesicle |
| Phagocytosis | engulfing of large particles or small cells by pseudopods; the cell membrane wraps around the particle and encloses it into a vacuole |
| Receptor-mediated Endocytosis | receptors latch onto ligands and endocytosis begins |
| Ligand | the general name for any molecule that binds specifically to a receptor site of another molecule |
| Aquaporins | special water channel proteins that facilitate the diffusion of massive amounts of water across a membrane |
Combine with other sets
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