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11 Cards in this Set
- Front
- Back
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Why does the resting membrane potential of cells align exactly with any ions Nerst potential?
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cells are permeable to many ions, not just one.
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Cells are closest to which ions Nerst potential?
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Potassium (K+)
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Why is the cells resting membrane potential closest to potassium?
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because at rest, the cell is most permeable to K+
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What does the G-H-K equation measure?
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the permeability of all ions as well as their Nerst potentials (taking into account all the external and internal ion concentrations + relative permeabilites)
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FF: Impermeable ions have no effect of the membrane potential
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BLANK
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How much affect an ion has of the membrane potential depends on...
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its relative permeability (influence is directly proportional to permeability)
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How is the cells resting membrane potential -88 mV when the EK is -90 mV?
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the cell is also slightly permeable to Na+ which accounts for the increase
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What is the ratio of permeability of K+ to Na+?
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100:1
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In which cell is Cl- most influential?
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Skeletal mm > neurons
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What is the main mechanism that controls the concentration gradient of Na+/K+?
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Na+/K+ ATPase
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Na+/K+ are also________________, because they are effectively pumping positive charge out of the cell with every cycle.
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electrogenic
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