Which type of cell is square and flat, forming the outer surface of the body and lining internal surfaces for protection?

• A. Epithelial Cell
• B. Nerve Cell
• C. Fat Cell
• D. Muscle Tissue

Answer: (A)

Epithelial cells form the protective coverings that line both the outside of the body and the inner surfaces of organs and cavities. When these cells are flat and plate-like, they’re known as squamous epithelial cells, which develop into a continuous, smooth barrier that protects underlying tissues. This shape is ideal for covering surfaces and lining linings because it allows close-packed cells with a durable, protective exterior.

Nerve cells are specialized for transmitting signals and have long extensions, not for forming protective sheets. Fat cells store energy as fat within adipose tissue, not for covering surfaces. Muscle tissue consists of fibers that contract to produce movement, not to cover and protect surfaces.