William Harvey — "The blood flows from the right ventricle through the lungs to the left auricle."
The blood flows from the right ventricle through the lungs to the left auricle.
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More from William Harvey
"Nature is the best teacher."
"It is better to know a little perfectly than to know much imperfectly."
"The heart by its pulsific action moves, perfects, and cherishes the blood, and preserves it from corruption and coagulation."
"The more accurately we search into the wonderful works of God, the more a reason we shall find to admire them."
"Nature is a free and open book, to be read and understood by all who have the patience and the power to do so."
About William Harvey (1578-1657)
English physician whose On the Motion of the Heart and Blood in Animals (1628) demonstrated blood circulation, overturning 1,400 years of Galenic medicine. Closely associated with Francis Bacon (his contemporary in the new English empiricism). For an intellectual contrast, see Galenic medicine, the 2nd-century Greek medical tradition (humors, blood-as-consumed-fuel) — Harvey calculated that the heart pumps more blood per hour than the body could possibly produce as fuel — a single quantitative observation that demolished the entire Galenic-Aristotelian medical worldview. The cleanest example in medical history of arithmetic disproving 14 centuries of authority.
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Understanding this quote
What it means
Blood exits the heart's right ventricle, travels through the lungs where it exchanges carbon dioxide for oxygen, then returns to the heart's left auricle — now called the left atrium. This describes the pulmonary circuit, one of two loops in the cardiovascular system. It establishes the lungs not merely as breathing bellows but as an active station where blood is refreshed before being pumped throughout the rest of the body.
Relevance to William Harvey
Harvey's 1628 masterwork De Motu Cordis overturned 1,400 years of Galenic medicine by proving blood circulates in a closed loop driven by the heart. As physician to King James I and King Charles I, he had access to resources enabling extensive dissection. This quote captures his central finding: the heart is a mechanical pump, and blood travels a defined anatomical route through the lungs and body rather than being continuously produced and consumed.
The era
In the early 17th century, Galen's second-century theory — that the liver perpetually generates blood consumed by organs — was unquestioned medical orthodoxy. The Scientific Revolution was upending ancient authority through systematic observation and experiment. Harvey practiced as human dissection was becoming more legally and institutionally available across Europe, the printing press was accelerating the spread of heterodox ideas, and quantitative reasoning was beginning to replace philosophical speculation in natural philosophy.
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