In the diagram above, adapted from Newton’s diagram in his 1687 Philosophiae Naturalis Principia Mathematica, we see the effect of gravitation on a comet that was visible between 1680 and 1681 ...

Anatomical diagram of Mosura fentoni, showing preserved details of the nervous system in purple, the digestive system in green, and the circulatory system in orange.

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 ...