A cell is isolated, and electrophysiology studies reveal that the resting membrane potential is ?70 mV. The predominant intracellular ion is Na+, and the predominant extracellular ion is K+
With voltage change, which of the following would result in an action potential?
a. K+ rushing into the cell
b. Na+ rushing into the cell
c. Na+ rushing out of the cell
d. K+ rushing out of the cell
ANS: A
With voltage change, potassium rushes into, not out of, the cell. Sodium movement is not related to this process.
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