Final answer:
Epithelial tissue acts as a barrier and controls the transfer of materials in and out of the body. It is found in areas such as the skin, airways, digestive tract, and urinary system.
Step-by-step explanation:
Epithelial tissue serves as a covering or lining of body parts, protecting the body and functioning in absorption, transport, and secretion. It acts as a barrier, controlling permeability and allowing selective transfer of materials across it. Almost all substances that enter or leave the body must pass through an epithelium, which includes areas like the skin, airways, digestive tract, urinary system, and reproductive system.
Learn more about Functions of epithelial tissue