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Physiology explains how the structures of the body work together to maintain life.
In order to observe structures in living people, however, a number of imaging techniques have been developed.
The field of cytology, which is the study of cells, and that of histology, which is the study of tissue organization from the cellular level up, both arose in the 19th century with the data and techniques of microscopic anatomy as their basis.
Thin sections and staining had become standard tools for microscopic anatomists by the late 19th century.
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