The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is ...

Circulatory system diseases. Heart disease is the leading cause of death for both men and women in the United States, claiming 610,000 people per year, according to the Centers for Disease Control ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The circulatory system consists of three independent systems that work together: the heart ...

The heart is the size of a fist and weighs 0.45kg - the equivalent of about half a bag ofsugar. In an adult of average fitness, it beats around 70 times a minute (at rest) and 100,000 times a day.

Your circulatory or cardiovascular system serves a vital function by delivering oxygen and nutrients to all the organs and tissues of your body. Learn more about how the circulatory system works ...

The circulatory system is the heart and all the blood vessels. Find out more with Bitesize. For students between the ages of 11 and 14.

The circulatory system consists of one heart, five liters of blood, and approximately 96,000 kilometers of blood vessels, responsible for transporting nutrients and waste throughout the body.

Your body's circulatory system is a wondrous thing. It's made up of blood vessels that carry blood to and from your heart and also pumps blood to your lungs so you can breathe.