Dr. Delillo studies the resting potential of neurons. He has found that _______ is the main reason the neuron is able to maintain the resting potential.
A) the size difference between the axon and dendrites
B) the sodium-potassium pump
C) the concentration gradient
D) the refractory period of the membrane

Question

Quizplus · Accepted Answer

The sodium-potassium pump is responsible for maintaining the concentration gradient of ions inside and outside the neuron, which is crucial for maintaining the resting potential. This ion pump transports 3 sodium ions out of the neuron for every 2 potassium ions it brings into the neuron, creating an overall negative charge inside the neuron. Option A is incorrect because the size difference between the axon and dendrites does not play a significant role in maintaining the resting potential. Option C is partially correct, as the concentration gradient is important, but it is specifically the sodium-potassium pump that maintains the gradient. Option D is incorrect because the refractory period refers to the time when a neuron is unable to generate an action potential, not the resting potential.

Dr Delillo Studies the Resting Potential of Neurons