Our blood vessels and hearts make up our circulatory system. The circulatory system’s most important function is to deliver oxygen, hormones and nutrients to organs, muscles, and tissues throughout our bodies. Another pivotal role of our circulatory system is to get rid of waste from organs and cells so our bodies can dispose of it. Did you know that our circulatory system stretches 66,000 miles, over 2.5 times Earth’s circumference?

“The distinction between nerves and vessels was not demonstrated until the Third Century B.C., when it was made clear by Erasistratos.” - James Henry Breasted