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Sodium-Potassium Pump and Membrane Potential
Grade Level
AP Biology
APB.155 Sodium-Potassium Pump and Membrane Potential
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After long-term Na+/K+ pump inhibition in a neuron, action potentials have lower peak amplitudes. Which prediction best explains this effect?
A
The Na+ gradient is increased, so Na+ entry stops completely.
B
The K+ gradient is increased, so the Na+ equilibrium potential becomes more positive.
C
The Na+ gradient is reduced, so the driving force for Na+ entry during depolarization is smaller.
D
Action potential amplitude is unrelated to ion gradients.
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