What ion is found on the outside of the neuron membrane that mostly contributes to a positive resting potential?
A)Calcium
B)Potassium
C)Sodium
D)Chloride

Question

Quizplus · Accepted Answer

Sodium ions have a higher concentration outside the neuron membrane than inside, contributing significantly to the positive resting potential. The movement of sodium ions into the neuron during an action potential is what triggers the depolarization phase.

What Ion Is Found on the Outside of the Neuron