ConXport Expansion Model of Urinary Bladder, The bladder collects and stores urine produced by the kidneys until it is ready to be expelled from the body. The bladder's muscular wall, known as the detrusor muscle, contracts to expel urine during the process of micturition (urination). The bladder can expand to accommodate varying volumes of urine, ranging from a few milliliters to around 400-600 milliliters. The expansion model of the urinary bladder typically showcases its structure, including the bladder wall, trigone (triangular area at the base), and urethral openings. The model may include the layers of the bladder wall, such as the mucosa, submucosa, muscular layer, and serosa, highlighting their roles in the bladder's functionality. Some models may demonstrate the bladder's ability to expand and contract, illustrating how it accommodates varying urine volumes.