Which of the following electrolytes plays a crucial role in maintaining the resting membrane potential of neurons and is also involved in the regulation of muscle contraction?

A Sodium
B Potassium ✓
C Calcium
D Magnesium

Explanation

Potassium plays a crucial role in maintaining the resting membrane potential of neurons and is also involved in the regulation of muscle contraction.

Source

Berne and Levy Physiology
Electrolytes and Acid-Base Balance Physiology Electrolyte Balance Medium MEDICAL Confidence: high