In the 2nd century, the Greek physician and philosopher Galen of Pergamon came up with a believable model for the circulatory system. He rightly recognized that the system involves venous (dark ...

has undertaken a new project taking thousands of samples to map the underground fungal networks that comprise the Earth’s “circulatory system.” “An understanding of underground fungal ...

Your circulatory system works all day, every day, to pump oxygen throughout your body. There are cardiovascular conditions that can impact this system. Your circulatory system, also known as your ...