Blood cells placed in a hypertonic solution (e.g., > 0.9% NaCl) will:
ARemain unchanged
BShrink because water flows out by osmosis
CSwell and burst
DBecome isotonic and inflate
Answer & Solution
Correct answer: B. Shrink because water flows out by osmosis
Hypertonic solution = higher solute concentration outside than inside the cell → water flows **out** by osmosis → cells **shrink (crenation)**. In a hypotonic solution they swell and may lyse.
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