The basement membrane is a thin, fibrous, extracellular matrix that separates epithelial and endothelial cells from their underlying connective tissue. It provides structural support and anchorage for the cells, as well as acting as a barrier to the movement of molecules.
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Epithelial Tissue: A type of tissue composed of one or more layers of cells that form the covering or lining of all internal and external body surfaces.
Extracellular Matrix: A complex network of proteins and carbohydrates surrounding cells within tissues, providing structural and biochemical support to surrounding cells.
Connective Tissue: Tissue that supports, binds together, and protects organs. It typically consists of relatively few cells embedded in an extracellular matrix