Who improved the microscope in a way that greatly impacted anatomy and physiology studies?

Anton van Leeuwenhoek (1632–1723) was a Dutch microscopist and scientist. Although he did not invent the microscope, he greatly improved the capability of the microscope. His expert skill in grinding lenses achieved a magnification of 270 times, which was far greater than any other microscope of the era. He was able to observe bacteria, striations in muscle, blood cells, and spermatozoa.