Which type of tissue covers body surfaces and lines organs?

Epithelial tissue is the type of tissue that covers body surfaces and lines organs. It serves several essential functions, including protection, absorption, secretion, and sensation. Epithelial cells are closely packed together, forming a barrier that helps to protect underlying structures from mechanical injury, pathogens, and dehydration.

In addition, epithelial tissue can be classified into various types based on the shape of the cells (such as squamous, cuboidal, or columnar) and the number of layers (simple or stratified). This versatility allows it to perform specialized functions, such as the exchange of substances in areas like the lungs (where simple squamous epithelium is found) or secretory functions in glands.

Understanding the role of epithelial tissue is crucial in fields like esthetics, where knowledge of skin biology and function can significantly impact treatments and services.