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.

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 ...

If we scrutinize the mechanism of the heart, we shall find that it involves ... aorta to force the blood through the vessels of the human body, is estimated by Hales, as being equal per square ...

But experts say sleep position can indeed matter ... "We know now that sleep really touches every body system, including the ...