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Cell Transport Def.

Science Study Guide

Osmosis The movement of water from high concentration to low.
Equilibrium When molecules are equally spread outand they move at equal rates in and out of the cell.
Passive Transport Movement across a cell membrane that requires NO ENERGY; diffusion and osmosis are examples of passive transport. Glucose moves into the cell by passive transport using a transport protein.
Active Transport Movement across a cell membrane that REQUIRES ENERGY. Molecules move from low concentration (less crowded) to high concentration areas (more crwoded). Plant roots use active transport to move more nutrients in.
Endocytosis When large molecules, such as bacteria and preteins, ENTER the cell.
Exocytosis When large molecules, such as wastes from the vacuoles or proteins packaged by the Golgi bodies, EXIT the cell.
Diffusion The movement of molecukles (liquid or gas) from an area of high cencentration (More crowded) to an area of lower lower concentration (less crowded). There is no energy required, it is a natural sqreading out.
Created by: 3083121