(in animals) a layer of covering cells lying on a basement membrane that is called simple epithelium when one cell thick and compound epithelium when several cells thick, and usually covers connective tissue embryologically derived from the ECTODERM.
The epithelium is a type of tissue that covers internal and external surfaces of your body, lines body cavities and hollow organs and is the major tissue in glands.
An epithelial tissue or epithelium (plural is epithelia) consists of cells arranged in continuous sheets, in either single or multiple layers. Even though epithelial tissue present in different parts of the body might differ in structure and function, they all have some common characteristics.
The epithelium is a layer of cells that are bound together tightly to form sheets. These continuous sheets cover different surfaces of your body that can come into contact with foreign substances.
The epithelium is a thin, continuous sheet of cells that covers every surface of your body, both inside and out. Your skin, the lining of your digestive tract, the inside of your blood vessels, the walls of your lungs: all epithelium.
epithelium, in anatomy, layer of cells closely bound to one another to form continuous sheets covering surfaces that may come into contact with foreign substances. Epithelium occurs in both plants and animals.
The term "epithelium" refers to layers of cells that line hollow organs and glands. It is also those cells that make up the outer surface of the body.
Epithelial tissues provide the body’s first line of protection from physical, chemical, and biological damage. The cells of an epithelium act as gatekeepers of the body, controlling permeability by allowing selective transfer of materials across its surface. All substances that enter the body must cross an epithelium.