This epithelium can be ciliated or nonciliated and lines the stomach, small and large intestines, gallbladder and rectum (the gastrointestinal tract). Its ciliated form lines the uterus, some respiratory air passages and sinuses, the central canal of the spinal cord and ventricles of the brain. What is this type of epithelium?
1) Simple squamous epithelium
2) Simple cuboidal epithelium
3) Simple columnar epithelium
4) Pseudostratified columnar epithelium