Pronunciation: [jˈuː sˈɛlz] (IPA) 
The term "U cells" refers to a type of cells found in the stomach lining that produce the hormone ghrelin, which stimulates appetite. The spelling of this term can be clarified through its phonetic transcription: /juː sɛlz/. The "U" in "U cells" is pronounced as /juː/, which sounds like the letter "y" in English. The plural form of the word is created by adding "-s" to the end of "cell," resulting in the sound /sɛlz/.
U Cells are specialized epithelial cells found in the urinary system, particularly in the urinary bladder. They are also known as umbrella cells due to their unique umbrella-like shape, which allows them to cover and protect the underlying layers of the bladder. U Cells form a waterproof barrier in the epithelial lining of the bladder and play a crucial role in maintaining its integrity and preventing the leakage of urine.
These cells are characterized by their large size and unique dome-shaped appearance. Multiple layers of U Cells stack on top of each other, resembling an umbrella structure when viewed under a microscope. The uppermost layer of U Cells is covered with glycoproteins and lipids that help maintain the impermeability of the bladder lining.
U Cells are involved in the stretching and contraction of the bladder when it fills and empties, respectively. Their ability to stretch and accommodate the change in volume ensures the bladder's elasticity and ability to hold larger volumes of urine. Furthermore, U Cells have numerous microvilli on their apical surface, which aids in the reabsorption of water and electrolytes from urine back into the bloodstream.
Overall, U Cells are essential in the proper functioning of the urinary system, as they provide protection, prevent urine leakage, and contribute to the bladder's capacity for storage and elimination of urine.
