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The conditions as regards the pulmonary circulation then corresponded with those mentioned as causes for oedema from venous obstruction.

The pulmonary circulation is a system within a system; and one action of the heart is the origin of both.

This is nature's safeguard against the accumulation of fluid in the dependent parts of the lungs at the terminal capillaries of the pulmonary circulation.

Before Columbus' Century closed, the discovery of the pulmonary circulation was an accomplished fact, and there was more than an inkling of the existence of the general circulation.

Columbus was the first to describe the pulmonary circulation.