William Harvey — "The valves in the veins are so constructed as to permit the passage of blood tow…"
The valves in the veins are so constructed as to permit the passage of blood towards the heart, but to prevent its return.
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More from William Harvey
"The book of nature is the only book that offers a wealth of content on every one of its pages."
"The human body is a machine, but it is also a living soul."
"The circulation of the blood is a discovery that overthrows all the ancient doctrines of medicine."
"The heart itself is the first to live and the last to die."
"I appeal to the evidence of my senses, and to the testimony of dissections."
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