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What is that thing pumping in your chest to help you run, dance, play, and live your life? Thump-thump, thump-thump. It's your heart! With every beat, your heart pumps blood through your body to help you keep going. It sends oxygen to the rest of your body and takes out the trash. And that's just the beginning! Explore what's inside you with fun text, bright pictures, and lively illustrations.
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