it is a sheet of cells that covers a body surface or lines a body cavity. It protects and contain nerve endings for sensory function. It secretes and absorbs molecules, and transports ions.
unique because it's made up almost entirely by cells
Epithelial tissue, when formed into layers, lies on top of connective tissue, from which it is separated by a basement membrane. The basement membrane supply nutrition to the epithelial.
avascular= lacks blood vessels
innervated= nerve endings supply energy
simple= one cell layer
secrete in serous membrane
air sacs in lungs, heart, lymphatic system, visceral organs
forms the wall of the smallest ducts of glands and tubules in kidneys
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