Contrary to a popular misconception, William Harvey did not explicitly predict the existence of capillaries, but he clearly saw the need for some sort of connection between the arterial and venous systems.
A pesar da crenza popular William Harvey, descubridor da circulación sanguínea, non predixo explicitamente a existencia de capilares, pero viu claramente a necesidade dalgún tipo de conexión entre os sistemas arterial e venoso.