Choose the FALSE statement.
A. Because sodium and potassium ions cross the membrane during an action potential, their concentrations inside the cell change significantly.
B. A hyperpolarized cell has a negative membrane potential compared to one at rest.
C. Within a single neuron, different types of voltage-gated ion channels may have different threshold voltages.
D. If a second graded potential begins before the first one ends, the voltage changes add together.
Answer: A. Because sodium and potassium ions cross the membrane during an action potential, their concentrations inside the cell change significantly.
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