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 ...

Your circulatory system contains three blood vessel types: arteries, veins, and capillaries. Arteries carry blood from the heart, unlike veins, which carry blood to the heart. According to the ...

The circulatory system includes the heart, blood vessels and blood, and is vital for fighting diseases and maintaining homeostasis (proper temperature and pH balance). The system's main function is to ...

The new How My Body Works app offers a kid-friendly introduction to the human body that's suitable for fourth to eighth graders. It has beautifully designed graphics and a wealth of video and audio ...

In 1895, when the German physicist Wilhelm Röntgen discovered mysterious rays that could pass through muscles, tendons and skin, he trained these invisible beams of light onto his wife’s fingers and ...