During an action potential, which of the following occurs?
a. Sodium ions are pumped out of the neuron into the synaptic cleft.
b. The molecular gates open to allow sodium ions into the neuron.
c. The electrical stimulation of the neuron must dip below -70 millivolts and remain so during the action potential.
d. Neurotransmitters enter the axon through gaps in the myelin sheath.
ANSWER: b
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