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14 Cards in this Set
- Front
- Back
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Ion movement depends on what two gradients?
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concentration and electrical
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For there to be no net ion movement, what condition must be met for the electrical and concentration gradients?
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They must be equal but opposite
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Flow of positive ions into a cell would cause the membrane potential to become more positive or negative?
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Positive
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What is the Nernst potential?
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The potential at which there is zero driving force for a particular ion. eg) the nernst potential for Na+ is 70mV
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What is the Nernst potential for K+
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-88mV
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What is the nernst potential for Ca++?
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+122mV
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What is the nernst potential for Cl-
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-47mV
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If a channel is selectively permeable to only Na+ and is the only ion channel open, what will that cells membrane potential be?
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70mV
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If a cell has the following permeability K+>Na+ will it have a negative or positive resting membrane potential?
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Negative
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What is the typical range for the resting potential of a cell?
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-60mV to -85mV
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The membrane at rest is most permeable to what ions?
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K+
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The cell is most permeable to K+ explaining the negative resting potential. The resting potential is, however, more positive that the nernst potential of K+. What causes this?
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Na+ leak channels are permeable to Na+ and allow it to leak into the cell, making the resting potential more positive
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Because no ion is at equilibrium in the cell, what is used to maintain the concentration of Na+ and K+ in the cell?
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Na+/K+ ATPase pumps out three Na+ in exchange for two K+, maintaining the gradient.
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Increases in extracellular K+ concentration would cause cell __________ (depolarization/hyperpolarization)
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depolarization
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