If there is a large blood loss to a person, either blood plasma or saline solution is injected

If there is a large blood loss to a person, either blood plasma or saline solution is injected into the blood. Why should not distilled water be used in this case?

Water should not be used, as the salt content outside the blood cells will be higher than in the cells. Water will begin to flow into the blood cells, they will swell and burst. And the person will suffer from oxygen starvation. And if you pour a saline solution, then the salt content will be the same both outside and inside the cells.