Blood does a body good

Studies of the superfluid aid in the prevention and treatment of diseases

By Sarah Webb, 15:38 PM August 17, 2011

Each time a human heart beats, blood rushes out of the muscular pump and winds through 60,000 miles of blood vessels. That network of tubes connects every cell of the body, each of them dependent on blood. This vital fluid delivers essential nutrients, carts away waste products, fights infection and heals wounds.

Blood is an amazing mixture of three different types of cells suspended in liquid called plasma. If you weigh 80 pounds (36 kilograms), your body probably contains at least 2 lit...

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