Which electrolyte plays a crucial role in regulating the excitability of neurons and muscle cells, and its imbalance can lead to cardiac arrhythmias?

A Sodium
B Potassium ✓
C Calcium
D Magnesium

Explanation

Potassium plays a crucial role in regulating the excitability of neurons and muscle cells, and its imbalance can lead to cardiac arrhythmias.

Mnemonic

P = Pulse, potassium regulates heart rhythm

Source

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