Describe depolarization and how it turns into a nerve impulse.
a) Depolarization involves the influx of sodium ions, making the inside of the cell more positive, which generates an action potential.
b) Depolarization involves the efflux of potassium ions, making the inside of the cell more negative, which generates an action potential.
c) Depolarization involves the influx of chloride ions, making the inside of the cell more negative, which generates an action potential.
d) Depolarization involves the release of neurotransmitters, initiating a nerve impulse.