What is the period of an action potential characterized by the membrane potential reaching -55mV and proceeding to become more positive through an influx of Na+ ions? What is the main property of the period?
a. Refractory period; no action potentials can be initiated at this time
b. Refractory period; action potentials are more likely to occur
c. Depolarization; initiation of action potential
d. Hyperpolarization; action potentials are more likely to occur at this time