What exactly does the blood do, where is blood made, and what is in it? Why does blood appear red when there is a cut, but seems blue or purple when one looks at the veins on the wrist? How does blood clot? These questions and more are explained in this Body Basics article about the mysterious, life-sustaining fluid called blood.

Provided by: The Nemours Foundation Topic: Software Date Added: Nov 2004 Format: HTML

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