The 𝐊𝐈𝐃𝐍𝐄𝐘 is the organ that filters blood and produces urine. It is multilobed (10 to 12 lobes) separated by renal columns (cortical tissue that extends alongside the margin of pyramids in the medulla),
The 𝐥𝐮𝐦𝐢𝐧𝐚 𝐨𝐟 𝐜𝐨𝐧𝐯𝐨𝐥𝐮𝐭𝐞𝐝 𝐭𝐮𝐛𝐮𝐥𝐞𝐬 in the kidney is lined with 𝐬𝐢𝐦𝐩𝐥𝐞 𝐜𝐮𝐛𝐨𝐢𝐝𝐚𝐥 𝐞𝐩𝐢𝐭𝐡𝐞𝐥𝐢𝐮𝐦. This kind of epithelial tissue is 𝘴𝘱𝘦𝘤𝘪𝘢𝘭𝘪𝘻𝘦𝘥 𝘧𝘰𝘳 𝘥𝘪𝘧𝘧𝘶𝘴𝘪𝘰𝘯 𝘢𝘯𝘥 𝘢𝘣𝘴𝘰𝘳𝘱𝘵𝘪𝘰𝘯. The movement of water and salts enters and exits the kidney tubules. The simple cuboidal epithelium facilitates the diffusion of these substances.

The 𝐔𝐑𝐄𝐓𝐄𝐑 transports urine from the kidney to the bladder. It is lined with an epithelium that is impermeable to water and ions. This epithelium is the 𝐭𝐫𝐚𝐧𝐬𝐢𝐭𝐢𝐨𝐧𝐚𝐥 𝐞𝐩𝐢𝐭𝐡𝐞𝐥𝐢𝐮𝐦, also known as the 𝐮𝐫𝐨𝐭𝐡𝐞𝐥𝐢𝐮𝐦. This type of epithelial tissue consists of two to three cell layers in the upper ureter with up to ten cell layers near the bladder. Moreover, the transitional epithelium has a distinct feature of dome-shaped cells or umbrella cells. They are the upper layer of cells that 𝙘𝙝𝙖𝙣𝙜𝙚 𝙨𝙝𝙖𝙥𝙚 𝙙𝙚𝙥𝙚𝙣𝙙𝙞𝙣𝙜 𝙤𝙣 𝙩𝙝𝙚 𝙙𝙞𝙨𝙩𝙚𝙣𝙩𝙞𝙤𝙣 𝙤𝙛 𝙩𝙝𝙚 𝙪𝙧𝙚𝙩𝙚𝙧 (relaxed).

The 𝐔𝐑𝐄𝐓𝐇𝐑𝐀 is a fibromuscular tube, which functions as a conduit for urine to exit the body, and in males, as a conduit for semen during sexual function.

𝐌𝐀𝐋𝐄 𝐔𝐑𝐄𝐓𝐇𝐑𝐀
Epithelia of different types line the male urethra, usually 𝐩𝐬𝐞𝐮𝐝𝐨𝐬𝐭𝐫𝐚𝐭𝐢𝐟𝐢𝐞𝐝 𝐨𝐫 𝐬𝐭𝐫𝐚𝐭𝐢𝐟𝐢𝐞𝐝 𝐜𝐨𝐥𝐮𝐦𝐧𝐚𝐫, 𝐭𝐫𝐚𝐧𝐬𝐢𝐭𝐢𝐨𝐧𝐢𝐧𝐠 𝐭𝐨 𝐬𝐭𝐫𝐚𝐭𝐢𝐟𝐢𝐞𝐝 𝐬𝐪𝐮𝐚𝐦𝐨𝐮𝐬 𝐞𝐩𝐢𝐭𝐡𝐞𝐥𝐢𝐮𝐦.

𝐅𝐄𝐌𝐀𝐋𝐄 𝐔𝐑𝐄𝐓𝐇𝐑𝐀
The female urethra is shorter and is initially lined by 𝐭𝐫𝐚𝐧𝐬𝐢𝐭𝐢𝐨𝐧𝐚𝐥 𝐞𝐩𝐢𝐭𝐡𝐞𝐥𝐢𝐮𝐦 𝐭𝐡𝐚𝐭 𝐭𝐫𝐚𝐧𝐬𝐢𝐭𝐢𝐨𝐧𝐬 𝐭𝐨 𝐬𝐭𝐫𝐚𝐭𝐢𝐟𝐢𝐞𝐝 𝐬𝐪𝐮𝐚𝐦𝐨𝐮𝐬 𝐞𝐩𝐢𝐭𝐡𝐞𝐥𝐢𝐮𝐦.

The one on the illustration that I made is the female urethra with stratified squamous epithelium.

REFERENCES:
Histology Guide (n.d.). Chapter 16 – Urinary System. Retrieved from https://histologyguide.com/slidebox/16-urinary-system.html

Indiana University (2016). Urinary System, The Urethra. Retrieved from https://vmicro.iusm.iu.edu/hs_vm/docs/lab11_6.htm

John Hopkins Medicine (n.d.). Anatomy of the Urinary System. Retrieved from https://www.hopkinsmedicine.org/health/wellness-and-prevention/anatomy-of-the-urinary-system#:~:text=The%20urinary%20system's%20function%20is,and%20converts%20them%20to%20energy.

Simple Cuboidal Epithelium: Location, Structure & Function. (2016, February 28). Retrieved from https://study.com/academy/lesson/simple-cuboidal-epithelium-location-structure-function.html.