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Kylemaxinne Panzo posted an update in the group
MT 30 – A (LAB) S.Y. ‘23-‘24 2 years ago Kylemaxinne B. Panzo
MT 30 – A (LAB)
Activity 6: Urinary System
The urinary system plays a key role in homeostasis by ensuring that blood is filtered of wastes and also maintains acid-base balance and blood pressure. Its primary parts are the kidneys, ureter, urinary bladder, and the urethra. The epithelial lining of these organs is a special epithelium called transitional epithelium or urothelium.
The human body has two kidneys and is found on the upper abdomen, one on each side of the spine. They function by filtering blood, removing wastes, while also maintaining blood pressure and solute concentration. They contain the renal pelvis, major calyces, outer renal cortex, inner renal medulla, renal pyramids, renal lobes, renal papilla, and nephrons – the kidney’s functional unit. The parts of the nephron include the renal corpuscle, proximal tubule, Loop of Henle, distal tubule, and the connecting tubule.
The ureter is a tube between the kidneys and the urinary bladder, and it carries urine from the renal pelvis to the renal hilum. The inner mucosa of the ureter consists of transitional epithelium, the next layer has smooth muscle, and the adventitia has connective tissue.
The urinary bladder, located in the pelvic cavity, stores urine before it is expelled. Its expansion is possible because of the type of epithelial tissues it has, which are transitional epithelium or the urothelium.
The urethra in the pubic area carries urine from the urinary bladder for it to exit the body. It is initially lined with urothelium, and progressively becomes alternating stratified columnar epithelium and pseudostratified columnar epithelium.
REFERENCES
Cleveland Clinic. (2022). Kidneys: Location, Anatomy, Function & Health. Retrieved from https://my.clevelandclinic.org/health/body/21824-kidney
Dalghi, M. G., Montalbetti, N., Carattino, M. D., & Apodaca, G. (2020). The urothelium: life in a liquid environment. Physiological reviews, 100(4), 1621-1705. 10.1152/physrev.00041.2019
Mescher A.L. (2018). Junqueira’s Basic Histology: Text and Atlas, 15th Edition. McGraw Hill. Retrieved from https://accessmedicine.mhmedical.com/content.aspx?bookid=3390§ionid=281539239
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