Which of the following best describes microscopic anatomy?

Microscopic anatomy is defined as the study of structures that cannot be seen with the naked eye, typically requiring a microscope for observation. This branch of anatomy focuses on cells, tissues, and their organization in the body. By examining these small components, one can understand how they contribute to the overall function and health of the organism.

In contrast, the other choices describe different aspects of anatomy or biology. The study of large structures visible to the naked eye pertains to macroscopic or gross anatomy. The discussion of the entire human body encompasses both microscopic and macroscopic perspectives and does not specifically focus on the minute structures. Lastly, the study of body functions and processes refers more to physiology than anatomy, which is concerned with the structure rather than the function of the body. Thus, the definition accurately highlights the focus of microscopic anatomy.