If the neural membrane were permeable only to potassium,the resting potential would be approximately _________mV.
A) +40
B) -40
C) -70
D) -80

Question

Quizplus · Accepted Answer

The resting potential of a neuron is primarily determined by the concentration gradients of potassium ions (K+) and sodium ions (Na+) across the neuronal membrane, as well as the selective permeability of the membrane to these ions. If the membrane were permeable only to K+, the resting potential would be primarily determined by the concentration gradient of K+, which is higher inside the cell than outside. This would cause K+ to flow out of the cell, resulting in a negative resting potential. The exact value of the resting potential depends on the specific ion channels and pumps present in the membrane, but a typical value for a neuron that is permeable only to K+ would be around -80 mV. Choice D (-80) is the best option.

If the Neural Membrane Were Permeable Only to Potassium,the Resting