Histology includes which of the following?

• A. Tissues
• B. Bruises
• C. Birthmarks
• D. All of the Above

Answer: (D)

Histology focuses on the microscopic structure of tissues—the organized arrangement of cells and the extracellular matrix that form the building blocks of organs. That direct fit is tissues, since histology examines how these tissue types (epithelial, connective, muscle, nerve) are arranged and how they look under the microscope in normal and diseased states. Bruises and birthmarks are clinical findings that reflect tissue changes, and you could study tissue samples from them histologically, but they aren’t the basic subject of histology itself. So the best answer is tissues.