Blood is a life-and-death issue. How does blood keep you alive? Every second of every day, blood delivers vital nutrients, oxygen, and other chemicals to all of your organs. It also carts away your body's waste. In addition, flowing blood can cool...
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Blood is a life-and-death issue. How does blood keep you alive? Every second of every day, blood delivers vital nutrients, oxygen, and other chemicals to all of your organs. It also carts away your body's waste. In addition, flowing blood can cool you off or warm you up, when necessary. Blood is also your best weapon against germs and other invaders. Your bloodstream creates microscopic defenders . . . See less 
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