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Definition
| Regulation of an organism's internal environment to maintain conditions needed for life. |
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Definition
| A plasma membrane with components constantly in motion, sliding past one another within the lipid bilayer. |
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Definition
| Property of the plasma membrane that allows it to control movement of substances into or out of the cell. |
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Definition
| Protein that moves substance or wastes through the plasma membrane. |
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Definition
| Energy-requiring process by which substances move across the plasma membrane against a concentration gradient. |
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Definition
| Net movement of particles from an area of higher concentration to an area of lower concetration. |
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Definition
| Condition of continuous, random movement of particles but no overall change in concentration of materials. |
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Definition
| Energy-requiring process by which large substances from the outside environment can enter a cell. |
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Definition
| Energy-requiring process by which a cell expels wastes and secretes substances at the plasma membrane. |
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Definition
| Passive transport of ions and small molecules across the plasma membrane by transport proteins. |
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Definition
| A solution that has a lower concentration of solute outside than inside the cell, causing water to flow into the cell by osmosis. |
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Definition
| A solution with the same concentration of water and solutes as inside a cell, resulting in the cell retaining its normal shape because there is no net movement of water |
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Definition
| Diffusion of water across a selectively permeable membrane. |
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Definition
| Flexible, selectively permeable boundary that helps control what enters and leaves the cell |
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Definition
| Measure of the amount of solute dissolved in solvent. |
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Term
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Definition
| Plasma membrane layers composed of phospholipid molecules arranged with polar heads facing the outside and nonpolar tails facing the inside. |
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