Why is great care taken in intravenous injections to have comparable concentration of solutions to be injected to that of blood plasma?

Explanation

During intravenous injections, the concentrations of the solution to be injected should be comparable to blood plasma. If the solution is less concentrated, its osmotic pressure will be low. The water will try to move into the red blood cells through the cell walls. As a result, cells will swell and burst. On the other hand, if the solution is more concentrated, the water in the cells will try to move outside the cell to the more concentrated solution by osmosis. This causes cells to shrink and consequently cease to function.