5 FACTS ABOUT
Beneath our skin, blood circulates our bodies, distributing the oxygen and nutrients we require to stay alive.Although the blood pumping through us is constant, the blood cells that rush through our veins are frequently being replaced. Red blood cells only live for around 120 days, and with the possibility of losing blood unexpectedly in accidents, we routinely need new supplies. Luckily, our bodies have a way of creating plenty more of them.