What type of tissue is characterized as smooth and covers the external layers of skin or lining of body cavities and organs?

Epithelial tissue is defined by its unique structure and function. This type of tissue consists of closely packed cells that form continuous sheets, which serve various roles such as protection, absorption, secretion, and sensation. Epithelial tissue is classified based on the number of layers and the shape of its cells, and it can be found covering the outer layer of the skin (epidermis) as well as lining body cavities and organs, providing a barrier and facilitating interactions between different tissues and the external environment.

In contrast, connective tissue, nervous tissue, and loose connective tissue serve different purposes in the body. Connective tissue supports, binds together, and protects tissues and organs, while nervous tissue is responsible for transmitting signals throughout the body. Loose connective tissue is a subtype that provides flexible support and cushioning. Each of these tissues has distinct characteristics and functions that differentiate them from epithelial tissue. Therefore, the characterization of smooth tissue that covers and lines surfaces directly points to epithelial tissue.