Full Show: The heart shape is the symbol of love, but a real heart looks nothing like a valentine. A long time ago, people used to think that your heart, not your brain, ran your body. Today, we know the 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! Learn more about your heart and how to keep it healthy from our experts, cardiologists Dr. Eric Carter and Dr. Eloisa Walker.
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