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Just about everyone knows that we can't live without blood. Without blood, our organs couldn't get the oxygen and nutrients they need to survive, we couldn't keep warm or cool off, we couldn't fight infections, and we couldn't get rid of our own waste products. Without enough blood, we'd weaken and die. So how exactly does blood do these things? How is it made, and what's in it? How does blood clot? These questions and more are explained in this article about the mysterious, life-sustaining fluid called blood. Two types of blood vessels carry blood throughout our bodies: The arteries carry oxygenated blood (blood that has received oxygen from the lungs) from the heart to the rest of the body. The blood then travels through the veins back to the heart and lungs, where it receives more oxygen. As the heart beats, you can feel blood traveling through the body at your pulse points - like the neck and the wrist - where large, blood-filled arteries run close to the surface of the skin.

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