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| a lipid that contains phosphorus and that is a structural component in cell membranes. |
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| the basic structure of a biological membrane, composed of two layers of phospholipids. |
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| a state that exists when the concentration of a substance is the same throughout a space. |
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| a difference in the concentration of a substance across a distance. |
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Definition
| the movement of particles from regions of higher density to regions of lower density. |
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| a protein that transports substances across a cell membrane. |
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| the diffusion of water or another solvent from a more dilute solution (of a solute) to a more concentrated solution (of the solute) through a membrane that is permeable to the solvent. |
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| a carrier protein that uses ATP to actively transport sodium ions out of a cell and potassium ions into the cell. |
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Definition
| anything that serves to direct, guide, or warn. |
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| a protein that binds specific signal molecules, which causes the cell to respond. |
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Definition
| a molecule that is generated when a specific substance attaches to a receptor on the outside of a cell membrane, which produces a change in cellular function. |
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