Both K⁺and Na⁺ions have a plus one charge, yet it is their relative concentrations that chiefly determine how negative the cell's membrane potential will be.

Question

Quizplus · Accepted Answer

The relative concentrations of K+ (potassium ions) and Na+ (sodium ions) across the cell membrane are crucial in determining the membrane potential. The membrane potential is primarily established by the concentration gradient of K+ due to the selective permeability of the membrane for K+ over Na+. However, Na+ ions also play a significant role, especially in the action potential and resting potential of neurons, where the differential distribution of these ions across the membrane contributes to the negativity of the cell's interior relative to the exterior.

Both K+ and Na+ ions Have a Plus One Charge

Both K⁺and Na⁺ions Have a Plus One Charge