Which tissue covers outside of the body and lines organs and cavities?

• A. Connective tissue
• B. Epithelial tissue
• C. Muscle tissue
• D. Nervous tissue

Answer: (B)

Epithelial tissue forms protective coverings and lining surfaces, which is exactly what’s described here. It covers the outside of the body—the skin’s outer layer—and lines the internal surfaces of organs and cavities such as the mouth, digestive tract, airways, and the walls of body cavities. This tissue is typically arranged as continuous sheets, is often avascular, and regenerates quickly. Its roles include protection, absorption, secretion, and filtration, and it comes in various shapes (squamous, cuboidal, columnar) and arrangements (simple or stratified), which fits the idea of both covering and lining.

Connective tissue provides support and connection, muscle tissue contracts to produce movement, and nervous tissue transmits signals. None of these alone describes both covering outside and lining internal surfaces as epithelial tissue does.