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17 Cards in this Set

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Movement of a substance without the use of energy by the cell
Passive Transport
A difference in the concentration of a substance across a space
Concentration Gradient
State in which the concentration of a substance is equal throughout a space
Equilibrium
Random movement of particles from an area of high concentration to an area of lower concentration
Diffusion
Movement of water through a selectively permeable membrane from an area of high concentration to an area of lower concentration
Osmosis
A solution that causes a cell to shrink because of osmosis
Hypertonic Solution
A solution that causes a cell to swell because of osmosis
Hypotonic Solution
A solution that causes no change in cell size
Isotonic Solution
Transport protein in a cell membrane through which ions can pass
Ion Channel
Transport protein that carries a specific substance across a cell membrane
Carrier Protein
Transport of substances through a cell membrane down a concentration gradient aided by the carrier proteins
Facilitated Diffusion
Movement against a concentration gradient requiring the use of energy by the cell
Active Transport
Carrier protein that transports sodium ions out of a cell and potassium ions into the cell
Sodium-Potassium Pump
Movement of a substance by a vesicle to the inside of a cell
Endocytosis
Movement of a substance by a vesicle to the outside of the cell
Exocytosis
Protein that binds to specific signal molecules, causing the cell to respond
Receptor Protein
Signal molecule produced in response to the binding of a chemical signal; alters the chemical activity within the cell
Second Messenger