Histology is the study of?

• A. Nervous system
• B. Circulation
• C. Hormones
• D. Microscopic structure of tissues

Answer: (D)

Studying the microscopic structure of tissues is histology. It means looking at tissue samples under a microscope to see how cells are arranged, how they connect, and what their components look like at a tiny scale. This helps you understand how tissues perform their functions and how they respond to skincare or barbering procedures. The nervous system, circulation, and hormonal signaling describe larger parts of the body or how it operates as a whole, not the tiny architecture of tissues themselves. In practice, knowing tissue structure supports understanding how skin layers and hair follicles are built and how products or treatments interact with those structures.