Now, as with any other cell in our body, these red blood cells age with time. And what that means is, with time, as they collide with other cells of our blood, with the walls of the capillaries, and as they squeeze through the tiny capillaries of our body, they are damaged. And eventually they must be destroyed. They must be broken down and they must be recycled in special areas of our body. Now, there are three places where red blood cells are generally recycled and broken down. It's inside our liver, inside the lymph nodes and also inside an organ known as the spleen.