Day and night, the muscles of your heart contract and relax to pump blood throughout your body. When blood returns to the heart, it follows a complicated pathway. If you were in the bloodstream ...

the human heart will beat more than 2.5 billion times. Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body.

The ribs and rib cage are excellent examples of the human body’s multifaceted ... and they may have a rapid heart rate. The ribs perform vital functions in the body, protecting organs and ...

The human body has different parts that help us do things ... They also protect the important organs inside you. Your ribs keep your heart, lung and stomach safe. And your skull acts as a tough ...

It also shows how the pacemaker cells restart her heart after the surgery. This short film is from the BBC series, Inside the Human Body. The 3D footage brings the topic to life and would enhance ...