The heart, arteries and veins of the circulatory system were all well known t people from prehistoric times. Its true function was not known, however, until William Harvey (April 1, 1578 - June 3, 1657) showed that it recirculated the same blood throughout the body.
They are not "discovered" but built.
It was Discovered
zheng he discovered a lolipop land
j.l.abbott discovered the Aztecs 400 years ago
loincloths
who was the muslim scientist who discovered respiratory system
he discovered the circulatory system back in 1628
WILLIAM harvey
Harvey discovered the blood circulatory system.
He discovered the circulation system of the body
closed circulatory system (double circulatory system)
They're both the circulatory system.
Amphibians have closed circulatory system Closed
no
The circulatory system
open circulatory systemclosed circulatory system.
The cadiovascular system, sometimes called the circulatory system when it includes the lymphatic system.