The heart is a ____ about the size of your fist, and it's one of the most important parts of your body. It works like a pump, constantly moving ____ around your body. The heart has four sections called chambers—two on the top (the ____) and two on the bottom (the ____). The right side of the heart pumps blood to your lungs to pick up ____. After the blood gets oxygen, it moves to the left side of the heart, which pumps it out to the rest of your body. The blood carries oxygen and nutrients to all your cells, giving them the energy they need to work. Then, the blood returns to the heart to start the process again. This happens every time your heart ____, which is about 100,000 times a day! The heart never stops working, even when you're asleep, because it keeps you alive and healthy.

The Heart

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