simple columnar epithelium

simple columnar epithelium collagen cross diagram cells dermatology material digestive stomach cerebrospinal fluid uterus microvilli narrow tall respiratory absorption mucus secretion ciliated nuclei neuroepithelium tract scientific protection connective tissue ependyma spinal cord types oval column glandular brain slender fallopian tubes lining intestines basement cell epithelial microscope cuboid stratified disease basal cellular surface membrane health biology vector medical cuboidal layer anatomy squamous skin organ cilia pseudostratified body immunity science structure medicine nucleus physiology educational element human