Which tissue type forms coverings and linings of many surfaces in the body, including the skin and internal organs?

Which tissue type forms coverings and linings of many surfaces in the body, including the skin and internal organs?

• A. Connective
• B. Nervous
• C. Muscular
• D. Epithelial

Answer: (D)

Epithelial tissue forms coverings and linings. It lines surfaces exposed to the outside and to internal cavities—the skin’s outer layer (the epidermis) shields the body, while other epithelium lines the digestive tract, respiratory tract, and the walls of blood vessels and organs. This tissue acts as a barrier, regulates what passes through (permeability), and often participates in secretion and absorption. Epithelial cells are tightly packed and sit on a basement membrane, with high regenerative capacity to replace cells lost to wear. By contrast, connective tissue provides support and connection, nervous tissue transmits signals, and muscular tissue contracts to generate movement. Thus, epithelial tissue best fits the description of forming coverings and linings.

Epithelial tissue forms coverings and linings. It lines surfaces exposed to the outside and to internal cavities—the skin’s outer layer (the epidermis) shields the body, while other epithelium lines the digestive tract, respiratory tract, and the walls of blood vessels and organs. This tissue acts as a barrier, regulates what passes through (permeability), and often participates in secretion and absorption. Epithelial cells are tightly packed and sit on a basement membrane, with high regenerative capacity to replace cells lost to wear. By contrast, connective tissue provides support and connection, nervous tissue transmits signals, and muscular tissue contracts to generate movement. Thus, epithelial tissue best fits the description of forming coverings and linings.