Histology (microscopic anatomy) is the study of how tissues are structured and how they work; Requires microscope.

• A. The study of how tissues are structured and how they work; Requires microscope
• B. The study of organs and body systems
• C. The science of causes and effects of disease
• D. The basic units of living matter

Answer: (A)

Histology is the study of how tissues are structured and how they work, and it is observed under a microscope. Because tissue organization and the interactions of cells within a tissue are at a microscopic scale, a microscope is essential to reveal how cells are arranged, how they connect, and how the extracellular matrix supports their function. This microscopic view links structure to function, showing how specific tissue designs enable particular roles in the body. The other descriptions point to different scales or topics: organs and body systems refer to macroscopic anatomy and physiology, pathology deals with disease causes and effects, and basic units of living matter aligns more with cell biology or cytology, which focuses on individual cells rather than tissue-level organization.