Please see the attached file of red blood cell. Inside and outside the concentration is same in the isotonic solution. So , blood celll do not shrink and swell when we placed in isotonic solution.
Thanks to recycling, we barely mine lead any more. An estimated 85 percent of lead in use today goes into batteries, mostly for automobiles. And when the batteries run down, 99 percent of this lead is recycled to make new batteries.
