Reference Article: Facts about the human circulatory system. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The circulatory system, also known ...

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 ...

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 ...