Screech! We are now at the heart. The heart weighs about 1 Lb, that's really light. The heart beats about 100,000 times a day. In your lifetime it beats about 2,000,000,000 times depending on how long you live. In your lifetime you pump enough blood to fill 56 Moon Rockets. Geez that's a lot. In your heart you have chambers. You have four chambers, and the upper chambers are called atria, and the lower chambers are called ventricles. Lets get going we're finished here.
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