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11 Cards in this Set
- Front
- Back
concentration gradient
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the difference in the concentration of a substance across a distance
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equilibrium
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the state in which the distribution of a substance is even throughout a region
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diffusion
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the movement of a substance from a region where its concentration is higher to a region where its concentration is lower
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osmosis
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the movement of water through a selectively permeable membrane from a more dilute solution to a more concentrated solution
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phospholipid
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made of a phosphate group and two fatty acids
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carrier protein
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transports specific substances across a cell membrane
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receptor protein
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binds to a signal molecule, enabling the cell to respond to the signal molecule
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lipid bilayer
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a double layer of phospholipids that is the foundation of a biological membrane
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signal
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anything that carries information between cells, serving to direct or warn
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sodium-potassium pump
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type of carrier protein that uses active transport to take sodium ions out of the cell and bring potassium ions into the cell
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second messenger
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acts as a signal molecule in a cell's cytoplasm
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