Which field studies cells of the body?

• A. Histology
• B. Cytology
• C. Anatomy
• D. Physiology

Answer: (B)

Cells are the basic units of life, and the field that studies them is cytology. It focuses on the structure, types, and behavior of individual cells, often using microscopes to examine cell components like the nucleus, mitochondria, and other organelles. This makes cytology the discipline dedicated to understanding cells themselves rather than larger assemblies.

Histology, by contrast, looks at tissues—the organized assemblies of many similar cells working together to perform a common function. Anatomy covers the body's structure at larger scales, from organs to organ systems, while physiology asks how those parts work and interact. A practical example of cytology is examining tissue or body-fluid samples to identify abnormal or cancerous cells, such as in Pap tests or other cell-based diagnostics.