How did Marcello Malpighi demonstrate the existence of capillaries?

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Marcello Malpighi demonstrated the existence of capillaries in 1661 by using a primitive microscope to observe the lungs of a frog.21

Through these observations, he identified and described the network of tiny blood vessels that connect small arteries to small veins. This discovery provided the essential missing link in William Harvey’s theory of blood circulation, confirming that blood does not simply transform into flesh in the periphery—as ancient medical teachings had previously suggested—but instead passes through a continuous vascular system.21