<prompt> Myoepithelium:-These are epithelial cells covering the muscle tissueThese are muscle cellsThese are epithelial cells with contractile unitsNone of above  <response>: Myoepithelial cells are epithelial cells with contractile units. These may be positive for alpha smooth muscle actin and can contract and expel the secretions of exocrine glands. Epithelial cells of various sites, paicularly sweat glands, mammary glands, salivary glands, may acquire the characteristics of smooth muscle cells are known as myoepithelial cells. Myoid cells of testis have contractile function in the seminiferous tubule. 