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11 Cards in this Set
- Front
- Back
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phospholipid |
a lipid that contains phosphorus and that is a structural component in cell membranes. |
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lipid bilayer |
basic structure of a biological membrane composed of two layers of phospholipids |
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equilibrium |
a state that exists when the concentration of a substance is the same throughout a space. |
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concentration gradient |
a difference in the concentration of a substance across a distance. |
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diffusion |
the moving of substances from an area of higher concentration to an area of lower concentration. |
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carrier protein |
a protein that transports substances across a cell membrane. |
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osmosis |
the diffusion of a solvent from a more dilute solution to a more concentrated solution. |
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sodium-potassium pump |
a carrier that uses energy to pump out sodium ions and pump in potassium ions. |
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signal |
anything that serves to direct, guide, or warn. |
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receptor protein |
a protein that binds specific signal molecules, which causes the cell to respond |
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second messenger |
a molecule that is generated when a specific substance attaches to a receptor outside of the cell that causes a change in cellular function |
