Na⁺ channels in a membrane open,allowing sodium ions to diffuse into a neuron.The membrane potential changes from -70 mV to -65 mV.This membrane response can best be described as A) equilibrium. B) hyperpolarization. C) graded depolarization. D) all-or-none depolarization. E) the generation of an action potential.

Question

Quizplus · Accepted Answer

The opening of Na^and channels allows sodium ions to diffuse into the neuron, which causes a graded depolarization of the membrane potential. The change from -70 mV to -65 mV indicates that the membrane potential is becoming more positive, but it is not yet reaching the threshold for an action potential. Graded depolarizations occur when the stimulus is subthreshold and the magnitude of the response depends on the strength of the stimulus.

Na+ Channels in a Membrane Open,allowing Sodium Ions to Diffuse

Na⁺ Channels in a Membrane Open,allowing Sodium Ions to Diffuse