What is the typical extracellular concentration of sodium (Na+) in mEq/L?

The typical extracellular concentration of sodium (Na+) is approximately 140 mEq/L. Sodium is the primary cation found in extracellular fluid and plays a critical role in various physiological processes including fluid balance, osmotic pressure regulation, and the generation of action potentials in nerve and muscle cells.

In healthy individuals, the homeostatic mechanisms of the kidneys and other regulatory systems maintain sodium levels within a narrow range. This concentration is vital for maintaining proper cellular function and overall electrolyte balance in the body.

While the other values mentioned (14 mEq/L, 4 mEq/L, and 2.4 mEq/L) are significantly lower than the typical extracellular concentration and would indicate severe electrolyte imbalances, they do not correctly represent the normal physiological state of sodium in extracellular fluid. Hence, the commonly accepted value is key for understanding normal versus pathological states in nursing practice and advanced physiology.