What tissue covers the surface of the body and lines cavities?

Epithelial tissue is a type of tissue that serves as a protective barrier covering the surfaces of the body and lining internal cavities and organs. It functions in various capacities, including protection, absorption, secretion, and sensation. The structure of epithelial tissue allows it to effectively act as a barrier, with cells closely packed together to form sheets. This makes it essential for both protecting underlying structures from physical damage and pathogens and facilitating various physiological functions.

In contrast, adipose tissue provides insulation and energy storage, but it does not cover body surfaces or line cavities. Nerve tissue is associated with the transmission of signals throughout the body, and muscle tissue is responsible for movement and stability, neither of which function to cover surfaces or line cavities. Thus, the role of epithelial tissue is distinctive and directly correlates with the question regarding what type of tissue covers the body and lines cavities.