Epithelium is found throughout the human body. It lines body cavities, as well as any hollow body tubes such as those found in the digestive and respiratory tracts. As food passes through the esophagus, layers of epithelium are scraped away. This epithelium is soon replaced with no harm to the human. Based on this description, epithelium should be placed into which organizational level ?

Answers:

Cell

Organ

Organ system

Tissue