PATHOLOGY

Detailed explanation-1: -Urethra. This tube allows urine to pass outside the body. The brain signals the bladder muscles to tighten, which squeezes urine out of the bladder. At the same time, the brain signals the sphincter muscles to relax to let urine exit the bladder through the urethra.

Detailed explanation-2: -The urethra then conducts urine from the bladder to the outside. The kidneys sit at the back of the abdominal wall and at the start of the urinary system. gallons of blood each day.

Detailed explanation-3: -It flows through tubes called ureters, and into the bladder. Urine leaves the body through the urethra.