Depolarization of the nerve cell membrane occurs when there is a rapid influx (inflow) ofa. potassium ions.b. chloride ions.c. calcium ions.d. sodium ions.e. proteins.
sodium ions.
Depolarization of the nerve cell membrane occurs when there is a rapid influx (inflow) of sodium ions (Na+). This occurs due to the opening of voltage-gated Na+ channels in response to a stimulus such as a neurotransmitter or sensory input. Influx of Na+ depolarizes the membrane potential, making it more positive and creating an action potential that can propagate down the length of the nerve cell. Potassium (K+) ions also play a role in repolarization of the membrane after depolarization, but they are not responsible for the initial depolarization. Chloride (Cl-) ions and calcium (Ca2+) ions are involved in other aspects of nerve cell function, but not in depolarization. Proteins also have various roles in nerve cell function, but they are not involved in depolarization.
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