History
Ibn al-Nafis theorized a "premonition of the capillary circulation in his assertion that the pulmonary vein receives what comes out of the pulmonary artery, this being the reason for the existence of perceptible passages between the two."
Marcello Malpighi was the first to observe and correctly describe capillaries when he discovered them in a frog's lung in 1661.
Read more about this topic: Capillary
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—Henry David Thoreau (1817–1862)