What is the study of tissues of the human body using a microscope called?

Histology is the study of the tissues of the human body at the microscopic level. This field involves examining the structure, composition, and function of different tissues, which can help to understand how organs and organ systems work together. Histologists use various staining techniques to make cellular structures more visible under a microscope, allowing for detailed assessments of tissue architecture and the identification of any pathological changes that could indicate disease.

In contrast, histopathology specifically refers to the examination of tissues to diagnose disease, often involving the study of tissue samples taken during biopsies. Anatomy focuses on the structure of organisms, while physiology studies the functions and processes occurring within the living body. Therefore, histology uniquely deals with the microscopic study of tissues, making it the correct choice for this question.