The study of anatomy of biological tissues at the microscopic level.

Histology (microscopic anatomy)

Microorganisms vary significantly in size, typically requiring microscopy for visualization. For comparison, a standard plant or animal cell is $${}10$$ to $${}100$$ micrometers (µm), while a typical bacterial cell is about $${}1$$ µm. Viruses are even smaller, with polio and flu viruses measuring around $${}50$$ nanometers (nm) and $${}100$$ nm respectively. Light microscopes can resolve objects larger than $${}100$$ nm, but visualizing smaller structures, like most viruses or molecules down to $${}1.5$$ nm, requires an electron microscope.

Microscopic Scale of Pathogens and Cells

The microscopic scale is the scale of objects and events that can only be seen using a microscope or other optical instrument because they are so small

Georgetown University

Scales of Size in the Natural Sciences

"The microscopic scale". Science Learning Hub. The University of Waikato. Archived from the original on 20 April 2016.

The microscopic scale

The macroscopic scale is the scale of objects and events that are large enough to be seen by the naked eye (without any optical instruments) .

Macroscopic scale

Microscopic scale

The quantum scale is the scale of atoms and subatomic particles. 

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