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 ...

How Does Blood Travel Through the Heart? As the heart beats, it pumps blood through a system of blood vessels, called the circulatory system. The vessels are elastic, muscular tubes that carry blood ...

How do humans change during their lifetime? Find out about the different stages of a human life cycle and how we change as we grow up. Find out how the skeleton helps us move and protects some of our ...

The circulatory system of the human body is complex. It is bound together by blood vessels, including arteries, veins, and capillaries, that facilitate the flow of blood throughout the body. The heart ...

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. It helps grow and ...

Quirks and QuarksOur planet’s circulatory system depends on animals eating, excreting and expiring From the tiniest insects to the largest whales, biologist Joe Roman says animals play an important ...