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The Heart!

The Heart: Heart Basics

The Heart: Heart Q&A

The Heart: Blood Q&A

The Heart: Lungs Q&A

The Heart: Heart Disease Q&A

The Heart: Blood Basics

  • Heart Basics
  • |
  • Heart Q&A
  • |
  • Blood Q&A
  • |
  • Lungs Q&A
  • |
  • Heart Disease Q&A
  • |
  • Blood Basics
Heart [härt]
The muscular organ that pumps blood through the circulatory system.

The heart shape is a symbol of love, but a real heart looks nothing like a valentine. A long time ago, people used to think your heart, not your brain, ran your body. Today, we know your heart is a muscle, the most important muscle in your body. Over an average lifetime, the heart beats more than two and a half billion times, pumping thousands of liters of blood through your body. And if this finely tuned engine stopped, you'd be dead in minutes!

Find out more about this topic by clicking on the buttons on this page. You can watch our video shorts and other programs by clicking on the links above or by going to Video. Facts will tell you more about the topic. Links will expand your learning beyond our site. Glossary gives you a list of specialized words. Books offer reading suggestions. Games give you a chance to play. Teachers provides materials for educators. Contact us by clicking on the link in the masthead to email us questions or comments. Click for the current season's schedule of programs, and be sure to check out my blog and our 360° videos.

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