A neuron is stimulated, which changes membrane potential to the point where voltage-gated Na⁺ channels open and begin depolarizing the cell. The neuron has reached
A)recruitment.
B)threshold.
C)summation.
D)tetanus.

Question

Quizplus · Accepted Answer

The question is describing the process of an action potential, and the point at which voltage-gated Na⁺ channels open and depolarization begins is the threshold. Therefore, the correct answer is B. Recruitment refers to the process of multiple neurons being activated to generate an action potential, summation refers to the addition of graded potentials to reach a threshold, and tetanus refers to a sustained contraction of muscle tissue.

A Neuron Is Stimulated, Which Changes Membrane Potential to the Point