In the context of the neural impulse,which of the following is true about the depolarization of neuron membranes?
A)It is characterized by the movement of neurotransmitters through the axon.
B)It decreases the charge difference between the fluids inside and outside of the neuron.
C)It is the brief wave of negative electrical charge that sweeps down the axon.
D)It produces sodium ions in the dendrites of a neuron.

Question

Quizplus · Accepted Answer

Depolarization of neuron membranes occurs when the charge difference between the fluids inside and outside of the neuron decreases. This happens when positive ions, such as sodium, rush into the neuron. This change in charge triggers the neuron to fire an action potential, or the neural impulse. Option A is incorrect because depolarization is not characterized by the movement of neurotransmitters, but rather by the movement of ions. Option C is incorrect because the brief wave of negative electrical charge that sweeps down the axon is actually the refractory period, which occurs after the action potential has been fired. Option D is incorrect because depolarization does not produce sodium ions in the dendrites of a neuron; rather, it causes them to rush into the neuron.

In the Context of the Neural Impulse,which of the Following