Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing
1.2% sodium chloride
0.4% sodium chloride
1.2% sodium chloride
0.4% sodium chloride.

Explanation

(i) 1.2% sodium chloride solution is hypertonic with respect to 0.9% sodium chloride solution or blood cells. When blood cells are placed in this solution, water flows out of the cells and they shrink due to loss of water by osmosis.
(ii) 0.4% sodium chloride solution is hypotonic with respect to 0.9% sodium chloride solution or blood cells. When blood cells are placed in this solution, water flows into the cells and they swell.