PYQ · UPSC Combined Defence Services 2023 · General Knowledge · Q3 Difficulty 2/5
Life Sciences: Biology and Human Health› Human Physiology, Nutrition and Food
If the red blood cells (RBCs) of human blood are isolated and are diluted in normal saline (an isotonic solution to blood), what will happen to the RBCs?
Answer d.
Explanation Answer · d
In an isotonic solution there is no net water movement, so RBCs keep their size. Normal saline (0.9% sodium chloride) has the same solute concentration as blood plasma. Water enters and leaves the red cells at equal rates, so they neither swell nor shrink.
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