What is the shape of transitional cells?

Transitional cells, which are characteristic of the urothelium lining the urinary bladder and parts of the urinary tract, display a unique and versatile shape that allows them to accommodate fluctuations in volume as the bladder fills and empties. The correct choice, which identifies their shape as spherical and polyhedral, emphasizes their capacity to change shape when stretched or relaxed, reflecting their function in the urinary system.

These cells can appear rounded when the bladder is full and more flattened or elongated when the bladder is empty. Their polyhedral nature refers to the multiple surfaces and angles that they can exhibit, allowing for a seamless fit and functional adaptation during urination. This ability to change shape is crucial for maintaining the integrity of the bladder wall and ensuring that it can efficiently contain urine without leakage.

Understanding the morphology of transitional cells is essential in the context of bladder function and pathology, such as in the detection of certain diseases where these cell types may show atypical characteristics. This insight into their structural adaptability highlights their specialized role in protecting underlying tissues from urine's potentially harmful effects.