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13 Cards in this Set
- Front
- Back
Excitable cell, like neurons, are more permeable to ___ than to ___.
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K+, Na+
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How would an increase in the number of passive K+ channels affect the membrane permeability to K+?
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More positive
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How would an opening of voltage-gated K+ channels affect the membrane permeability to K+?
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More positive
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How would closing the voltage-gated K+ channels affect the membrane permeability to K+?
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More negative
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What acts as a chemical force that pushes K+ out of the cell?
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Concentration gradient
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What force tends to pull K+ back into the cell?
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Electrical gradient
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When the concentration and electrical gradient are equal and opposite in a cell permeable only to K+, what is this called?
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Equilibrium potential
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The equilibrium potential for K+ is at ___mV.
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-90mV
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In an excitable cell, also permeable to Na+ and Cl-, the concentration gradient and electrical gradient would both tend to move Na+ ___ the cell.
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Into
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Does the concentration gradient (oppose / promote) the movement of Cl- into the cell?
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Promote
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Does the electrical gradient (oppose / promote) the movement of Cl- into the cell?
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Oppose
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What is the resting membrane potential?
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-70mV
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What compensates for the leakage of Na+ and K+ ions?
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Na+/K+ pump
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