Which type of tissue covers body surfaces and lines cavities?

The correct choice is epithelial tissue. This type of tissue plays a crucial role in protecting the body as it serves as a barrier between the internal environment and the external world. Epithelial tissue is distinguished by its tightly packed cells, which form continuous sheets that cover surfaces and line cavities throughout the body.

Additionally, epithelial tissue is involved in various functions, including absorption, secretion, sensation, and protection. It is categorized into different types based on the shape of the cells (such as squamous, cuboidal, and columnar) and the number of layers (simple or stratified).

Understanding this helps to recognize the significant functions that epithelial tissue performs in different organs, such as its role in the skin (protective layer), the lining of the digestive tract (absorption), and respiratory pathways (mucus secretion). Its unique characteristics allow it to fulfill these diverse functions effectively.