blood, , heart, , arteries, it carries blood from the heart to muscles, veins, carries blood to the heart, capillary, tiny tube that connects arteries and veins, lungs, organ in your chest that help you breathe, trachea, it lets air into the lungs, diaphragm, muscle under your lungs used for breathing in and out, carbon dioxide, you breath it out of your mouth, pulse, .

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