The document describes the anatomy and physiology of the urinary system. It discusses the kidneys, which filter blood to produce urine and regulate electrolytes and acid-base balance. Urine travels from the kidneys through ureters to the bladder, where it is stored until voiding through the urethra. The kidneys contain nephrons that filter blood and reabsorb necessary substances. The document also reviews urinary system diseases, diagnostic workup, bladder function, nerve supply, the process of urination, and common urinary problems.