Final answer:
In the urinary bladder, circular folds allow for even greater distension, helping it accommodate a larger volume of urine.
Step-by-step explanation:
In the urinary bladder, there are mucosal folds, called circular folds, that allow for even greater distension. This is due to the highly distensible nature of the bladder and the presence of irregular crisscrossing bands of smooth muscle, known as the detrusor muscle. The transitional cellular epithelium lining the bladder also facilitates large volume fluctuations.
When the bladder is empty, the mucosal folds are folded and when the bladder is stretched, the folds unfold, allowing the bladder to expand. This helps accommodate a larger volume of urine in the bladder.