William Harvey
Annelida
Mr Bobadev
W. H . Harway , and Malpighi .
i believe it was william harvey
To move blood around the body, to and from the heart.
the heart
Mosses and worts are non-vascular. The ferns were the first plant species to develop a circulatory system that lets them grow larger. They have roots, leaves, stems, and trunks. With their new vascular system, the sky was the limit for plants.
William Harvey (1578-1657) is recognized as the man who discovered and published the first accurate description of the human circulatory system, based on his many years of experiments and observations as a scientist and physician.
Adam Smith
They go first to the liver via the hepatic portal vein.
No, da Vinci was not the first person to explain why the sky is blue. John Tyndall was the fist person to begin to explain this phenomenon in 1859.
They're the short-term, first reactors to a breach in the circulatory system.