Which electrolyte plays a crucial role in regulating the excitability of nerve 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 nerve and muscle cells. Its imbalance can lead to cardiac arrhythmias, muscle weakness, and other complications.

Mnemonic

_POTASSIUM - Powering Organ function Through Action On Skeletal and Smooth muscle In UM (Unit of Measurement)

Source

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