Which of the following electrolytes plays a crucial role in maintaining the resting membrane potential of nerve and muscle cells by balancing the positive charge of sodium ions?

A Potassium ✓
B Sodium
C Calcium
D Magnesium

Explanation

Potassium ions play a crucial role in maintaining the resting membrane potential of nerve and muscle cells by balancing the positive charge of sodium ions.

Mnemonic

'K' = Key to membrane potential

Source

Berne and Levy Physiology
Electrolytes and Acid-Base Balance Physiology Electrolyte Balance and Nerve Function Easy MEDICAL Confidence: high