Where can you find this epithelium skin bladder trachea blood vessels The following heavy metals are important in the operational principle of electron microscope lead and silver lead and magnesium Lead and Uranium Aluminum and cobalt identify this tissue type simple squamous simple columnar stratified squamous Simple cuboidal Identify this tissue. Where can you find it? simple squamous, alveoli stratified columnar, lungs simple columnar, small intestine transitional, urinary bladder.