What is the normal Na+/K+ ratio in the body?

• A. 40:1
• B. 10:1
• C. 30:1
• D. 20:1

Answer: (C)

The normal Na+/K+ ratio in the body is typically considered to be around 30:1. This ratio reflects the balance of sodium and potassium ions, which are essential for various physiological processes, including nerve function and muscle contraction.

In a healthy individual, sodium (Na+) concentration in plasma is generally much higher than that of potassium (K+), aligning with this ratio. Sodium ions play a crucial role in maintaining extracellular fluid volume and are involved in the transmission of electrical signals in the nervous system. Conversely, potassium is the predominant intracellular cation and is vital for maintaining normal cellular functions.

Maintaining this ratio is critical for homeostasis, and any significant deviations can have notable implications on cardiovascular health, muscle function, and overall metabolic processes. Understanding this balance helps in assessing and diagnosing various medical conditions related to electrolyte imbalances.