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Exercitatio Anatomica de Motu Cordis et Sanguinis in Animalibus

March 4th, 2005 Medgadget Editors the good old days...

William Harvey (April 1, 1578 - June 3, 1657)The monumental work by William Harvey, published in 1628, that established the “double circulation” of blood through a systemic and pulmonary circuits, is available for your peruse in English translation here. Money quote:

First of all, the auricle contracts, and in the course of its contraction forces the blood (which it contains in ample quantity as the head of the veins, the store-house and cistern of the blood) into the ventricle, which, being filled, the heart raises itself straightway, makes all its fibres tense, contracts the ventricles, and performs a beat, by which beat it immediately sends the blood supplied to it by the auricle into the arteries. The right ventricle sends its charge into the lungs by the vessel which is called vena arteriosa, but which in structure and function, and all other respects, is an artery. The left ventricle sends its charge into the aorta, and through this by the arteries to the body at large.
These two motions, one of the ventricles, the other of the auricles, take place consecutively, but in such a manner that there is a kind of harmony or rhythm preserved between them, the two concurring in such wise that but one motion is apparent, especially in the warmer blooded animals, in which the movements in question are rapid. Nor is this for any other reason than it is in a piece of machinery, in which, though one wheel gives motion to another, yet all the wheels seem to move simultaneously; or in that mechanical contrivance which is adapted to firearms, where, the trigger being touched, down comes the flint, strikes against the steel, elicits a spark, which falling among the powder, ignites it, when the flame extends, enters the barrel, causes the explosion, propels the ball, and the mark is attained – all of which incidents, by reason of the celerity with which they happen, seem to take place in the twinkling of an eye.

There you have it: our regular Friday feature “the good old days…” and an enlightening reading for the upcoming weekend.
Thanks for stopping by and have a great and relaxing weekend everyone!

Medgadget Editors

Medical technologies transform the world! Join us and see the progress in real time. At Medgadget, we report the latest technology news, interview leaders in the field, and file dispatches from medical events around the world since 2004.

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