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0.9% (mass/volume) sodium chloride solution is called the 'normal saline solution' because:
AIts osmotic pressure is the same as that of the fluid inside blood cells (isotonic) — safe for IV injection
BIt exactly matches the molarity of blood plasma sodium
CIt tastes salty
DIt is hypertonic to plasma
Answer & Solution
Correct answer: A. Its osmotic pressure is the same as that of the fluid inside blood cells (isotonic) — safe for IV injection
Normal saline is **isotonic with blood plasma**; the cells neither shrink nor swell when exposed to it, so it's safe for IV administration.
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