Which tissue type covers surfaces and lines cavities?

• A. Connective
• B. Nerve
• C. Epithelial
• D. Muscle

Answer: (C)

Epithelial tissue forms the coverings that line body surfaces and the cavities inside the body, such as the skin surface and the lining of the digestive tract. This tissue acts as a protective barrier and also participates in secretion, absorption, and filtration. Epithelial cells are tightly packed with little extracellular matrix and can be arranged in single or multiple layers and in various shapes (squamous, cuboidal, or columnar), reflecting different protective and functional roles. It is avascular, relying on diffusion from the underlying connective tissue for nutrients. This combination of lining and covering roles distinguishes it from other tissue types: connective tissue primarily supports and connects, nerve tissue transmits signals, and muscle tissue contracts to produce movement.