Simple cuboidal epithelium – This type of epithelial tissue can be found in the kidneys of the body. It contains one layer of cube-shaped cells and have oval or circular nuclei. Its main function is for absorption and secretion which can also be a function of the kidney. The organ functions to remove waste products and maintain a healthy balance of water, salts and other minerals for the body.

Transitional epithelium – This type of epithelium is predominant in the urinary tract. It is found in the urinary bladder, specifically in the urothelium. Urothelium serves as the lining and barrier that prevents the urine from leaking out to your body. The transitional epithelium is stratified and varies in shape. It is a stretchable epithelium that helps the bladder to accommodate large volumes of urine.

Smooth muscle – this type of muscular tissue has no striations and moves involuntarily. It is found in the urethra of the urinary tract. Urethra is the tube that contracts and urine passes through to be excreted out. The smooth muscle is arranged longitudinally in the wall of the urethra. It functions in the contraction during urination to control its bladder movement.