Osmotic pressure and Acid-base balance of body fluids are maintained by
Sodium
The correct answer is Sodium.
Sodium is the main cation of the extracellular fluid (135–145 mEq/L) and accounts for most of its osmolality, so it governs osmotic pressure and water distribution. Through renal Na⁺–H⁺ exchange, linked to bicarbonate reabsorption, it also helps regulate acid-base balance.
Magnesium is mainly intracellular and acts as an enzyme cofactor; fluorine strengthens teeth and bones; zinc is a trace element for enzymes and immunity — none maintains osmotic pressure.
Short trick: ECF king = Sodium (serum osmolality ≈ 2 × Na⁺).
Important Questions from Fundamental Nursing
The early indicator of hypoxia in the unconscious clients?
Principles of ethical practice includes the following, EXCEPT
The normal levels of sodium in plasma is
To which position will you change a client with hypovolemic shock?
The most suitable position for giving an enema is ______
