VPY-0031
QUESTION
When RBC is suspended in iso osmotic fluid, it results in?
OPTIONS
(A) Lysis
(B) Swelling
(C) Lysis
(D) No change
ANSWER
(D) No change
EXPLANATION
No change is the correct option because an RBC placed in an isotonic or iso-osmotic fluid experiences approximately equal effective osmotic pressure inside and outside the cell, so there is no net movement of water and the cell maintains its normal volume. Lysis occurs in sufficiently hypotonic solutions, while swelling also reflects water entry rather than isotonic conditions.
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