Passive TransportMovement of molecules from a high concentration to a low concentration
No energy needed Diffusion: movement of ANY molecule Osmosis: movement of H2O only Facilitated diffusion: movement of molecules with the help of a protein |
Active TransportMovement of molecules against the concentration gradient from low to high
Energy is required (ATP) Endocytosis - a cell bringing in larger materials; i.e. a white blood cell eating a bacterium Exocyotsis - a cell spitting out materials |
For more explanations, use the link above to go to the Tonicity page
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