Red Blood cells

Did you know that

red blood cells
   There are more red blood cells in the body than any other kind of cell? Some 25 trillion of the plump, round dimpled cells course through the bloodstream. The sole task of these tiny cells is to bring oxygen to all of the body's tissue and remove carbon dioxide.
   Each of the cells travels approximately 173,000 times between the lungs and other tissues before it dies. The red blood cell has a life span of about 120 days. At that time, the aging cell is caught by a macrophage and digested.