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artery	Arteries are natural tubes inside your body that carry blood from your heart to other parts of your body. Blood in your arteries is red.
bleed	When a person is bleeding, it means that they are losing blood from some part of their body. If we say that part of a person's body is bleeding, like their arm or their finger, we mean that blood is coming out of it.
blood	Blood is the red liquid that goes through your body. When you eat food, the things that your body needs from the food go into your blood. The blood brings these things to all the parts of your body. This is one reason why blood is so important.
heart	Your heart is a thing inside your chest that sends out blood through your whole body. Your heart and your brain are the most important parts of your body. [1/4 definitions]
needle	A needle is a very thin metal tube with a sharp point at one end. Doctors and nurses use this kind of needle to put medicine in or take blood out of a person's body. [1/3 definitions]
swell	When something swells, it gets larger little by little. If you hit your finger hard with a hammer, your finger might swell. This is because blood and other liquids in the body are rushing to your finger to try to help it heal. This is a good thing, but it's not good if something swells too much.
vein	A vein is one of the small, natural tubes inside the body that carry blood toward your heart. Veins look blue in color. Sometimes you can see them under people's skin.

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