WHAT'S INSIDE: HUMAN BODY

The human body is an amazing structure made up of many fascinating parts and systems. Learn about the human body and how its systems work together.
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  • Body Systems
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How much do you know about the human body?

From the Discovery Health series "Body Invaders", Dr. Gil Spierings explains common causes of headaches.

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Top 10 Biggest Bodybuilders

How does a 97-pound weakling become the World's Most Perfectly Developed Man, as Charles Atlas did? Through the sport known as bodybuilding. Here are 10 of the greatest, most well-known bodybuilders to grace the stage.

What determines the rhythm of your heart?

When it comes to the heart, timing is critical. An irregular heartbeat is inefficient and deprives the body of blood. So what sets your ticker's rhythm?

HEALTH: HUMAN BODY
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