Which epithelium lines the urinary bladder and can stretch without tearing?

Which epithelium lines the urinary bladder and can stretch without tearing?

• A. Transitional epithelium
• B. Simple squamous epithelium
• C. Simple cuboidal epithelium
• D. Pseudostratified epithelium

Answer: (A)

The lining needs to be able to expand as the bladder fills while staying intact. Transitional epithelium, also called urothelium, fits this need perfectly. It is a layered, stretchy tissue with dome-shaped apical cells that flatten when stretched, allowing the bladder to distend without tearing and providing a barrier to urine. Other epithelia lack this combination of distensibility and impermeability, which is why they don’t line areas like the bladder in the same way.

The lining needs to be able to expand as the bladder fills while staying intact. Transitional epithelium, also called urothelium, fits this need perfectly. It is a layered, stretchy tissue with dome-shaped apical cells that flatten when stretched, allowing the bladder to distend without tearing and providing a barrier to urine. Other epithelia lack this combination of distensibility and impermeability, which is why they don’t line areas like the bladder in the same way.