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: -In males, the urethra has four functions – the expulsion of urine, the expulsion of sperm, the prevention of either of these fluids from traveling back into the lower urinary tract, and protection against bacteria entering from outside of the body.

Detailed explanation-3: -The kidneys receive a high blood flow and this is filtered by very specialised blood vessels. The fluid that is filtered is then adjusted by a complex series of urine-disposing tubes called tubules.