Osmosis is the passive transport of water Animal cells are not tolerant of excessive osmotic uptake or loss of water. A solution with a greater solute concentration than that inside a cell. A solution with a lower solute concentration compared to that inside a cell. A solution with an equal solute concentration compared to that inside a cell. Measure of the tendency for a solution to take up water when separated from pure water by a selectively permeable membrane.
Transport proteins are specific for the solutes they transport.
Energy-requiring process during which a transport protein pumps a molecule across a membrane, against its concentration gradient. The sodium-potassium pump. Exocytosis Endocytosis Process of exporting macromolecules from a cell by fusion of vesicles with the plasma membrane. Used by cells to incorporate extracellular substances.