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Arch Iran Med. May;11(3) doi: /AIM A brief history of the discovery of the circulation of blood in the human body. Azizi MH(1).
Table of contents

Prior to Harvey, it was thought that the active phase of the heartbeat, when the muscles contract, was when the heart increased its internal volume. So the active motion of the heart was to draw blood into itself.

References

Harvey observed the heart beating in many animals—particularly in cold-blooded animals and in animals near death, because their heartbeats were slow. He concluded that the active phase of the heartbeat, when the muscles contract, is when the heart decreases its internal volume and that blood is expelled with considerable force from the heart. It is tempting to view Harvey, with his quantitative experiment and his model of the heart as a pump , as someone who supported or was inspired by the new mathematical and mechanical ideas of the 17th century, which played significant roles in the scientific revolution of the time.

However, there is a need for considerable caution here. Harvey did quantify blood flow, but his quantification is very approximate, and he deliberately used underestimates to further his case. This is very different from the precise quantification leading to the mathematical laws of someone like Galileo. It was important that Harvey saw the heart as a pump, but he saw it as an organic pump, rather than as a mechanical pump. He also interpreted the blood as having an irreducible life force of its own. It is likely that Harvey actually made his discovery of the circulation about — Such a major shift in thinking about the body needed to be very well supported by experiment and argument to avoid immediate ridicule and dismissal; hence the delay before the publication of his central work.

William Harvey. Article Media.

Misunderstood Geniuses: William Harvey

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[ Michael Servetus Institute] [Blood circulation]

Thank you for your feedback. The reason why there are two sets of atria and ventricles is because there are two distinct locations for blood transport.

When and where

There is therefore a separate circulation for the lungs right side of heart and for the rest of the body left side of heart. Overview of Pulmonary and Systemic Circulation. Brent Cornell. Cell Introduction 2. Cell Structure 3. Membrane Structure 4.


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