ANATOMY

Detailed explanation-1: -The inner lining of the urinary bladder is a mucous membrane of transitional epithelium that is continuous with that in the ureters. When the bladder is empty, the mucosa has numerous folds called rugae. The rugae and transitional epithelium allow the bladder to expand as it fills.

Detailed explanation-2: -The wall of the bladder is comprised of smooth muscle fibers oriented in multiple different directions. These smooth muscle fibers are collectively known as the detrusor muscle. This interwoven orientation provides the bladder with the ability to stretch in response to the presence of urine.

Detailed explanation-3: -A distended bladder is a condition in which the bladder becomes enlarged or inflamed. The swelling is caused by pressure on the bladder that can either come from an internal source or external one, and may lead to the urge to urinate, even when the bladder is empty.

Detailed explanation-4: -Its inner lining is transitional epithelium, tissue that expands when not stretched and becomes thinner, similar to stratified squamous epithelium, when stretched. This allows the bladder to expand to provide more room for storing urine.

Detailed explanation-5: -Similar to the uterine walls, there are stretch receptors in the walls of the urinary bladder. Although the capacity of the urinary bladder is around 750 ml (about the size of a bottle of wine), the stretch receptors start to respond when the volume reaches somewhere between 200 and 400 ml.