active transport - energy requiring movement of molecules across a membrane from a region of lower concentration to a region of higher concentration, passive transport - movement of molecules across the cell membrane without energy input from the cell, selectively permeable - condition or quality of allowing some, but not all, materials to cross a barrier or membrane, diffusion - movement of dissolved molecules in a fluid or gas from a region of higher concentration to a region of lower concentration, osmosis - diffusion of water molecules across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration, facilitated diffusion - diffusion of molecules assisted by protein channels that pierce a cell membrane, endocytosis - uptake of liquids or large molecules into a cell by inward folding of the cell membrane, exocytosis - release of substances out of a cell by the fusion of a vesicle with the membrane, sodium-potassium pump - active transport protein in neurons that carries sodium (Na+) ions out of the cell and bring potassium (K+) ions into the cell, hypotonic - solution that has a lower concentration of dissolved particles compared with another solution, hypertonic - solution that has a higher concentration of dissolved particles compared with another solution, isotonic - solution that has an equal concentration of dissolved particles compared with another solution, turgor pressure - the force within a cell that pushes the plasma membrane against the cell wall, contractile vacuole - a vacuole in a unicellular organism that contracts regularly to discharge fluid, especially water, from a cell,

Cellular Transport

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