William Harvey, a 17th-century English scientist, made an important contribution to biology with his:
A) Explanation of the circulatory system ü B) Invention of the microscope C) Research on vaccination to immunize against disease D) Study of the electrical nature of nerve impulses
Harvey (1578-1657) established the role of arteries and veins in the circulation of the blood, and the true relationship between the pulse and the action of the heart. His work at last displaced the mistaken theories of the second-century physician Galen, although the conservative medical practitioners of the day were slow to see the significance of his discoveries. The first microscope useful for biological study was invented by Anton von Leeuwenhoeck (1632-1723). The first experiments relating electric currents to nerve impulses were carried out by Luigi Galvani (1737-1798). Immunization through vaccination was invented by Edward Jenner (1749-1823).
