From the moment it begins beating until the moment it stops, the human heart works tirelessly. In an average lifetime*, the heart beats more than two and a half billion times, without ever pausing to rest. Like a pumping machine, the heart provides the power needed for life.

This life-sustaining power has, throughout time, caused an air of mystery to surround the heart. Modern technology has removed much of the mystery, but there is still an air of fascination and curiosity.

Explore the heart. Discover the complexities of its development and structure. Follow the blood through the blood vessels. Wander through the weblike body systems. Learn how to have a healthy heart and how to monitor your heart's health. Look back at the history of heart science.

Soon, your fascination and curiosity may lead to understanding and respect.

To learn even more about the heart, try taking a look at some recommended resource materials, enrichment activities, and a brief glossary.

*Note: The average lifetime total heartbeats is based on an average of 72 beats per minute during an average lifespan of 75 years. 72 beats per minute x 60 = 4,320 beats per hour. 4,320 beats per hour x 24 = 103,680 beats per day. 103,680 beats per day x 365 = 37,843,200 beats per year. 37,843,200 beats per year x 75 = 2,838,240,000 beats in an average lifetime.