The urinary tract consists of two kidneys with both renal pelvis,
ureters, the bladder and the urethra. In the renal pelvis, the urine collected. From both the pelvis a ureter. The ureters run to the bladder, where they have an outlet in the bladder at an oblique angle. Because of said oblique angle, the ureter mouth by filling of the bladder clenched with the aid of a muscle. Muscle that ensures that no urine from the bladder to the kidney may come back.
The transport of the urine from the kidney direction of the bladder takes place by peristalsis in the urinary tract. The urine is pinched by the valve mechanism towards the bladder. The place where the ureters lead they call the bladder base. Here are the muscles that backflow prevention, but also record bladder filling and bring urination (micturition) going. In the bottom bladder, the bladder wall via the urethra into the bladder neck, through which the urine is discharged to the outside. A muscle mechanism ensures that micturition can find. Random place
In men, the urethra is about 20 to 25 cm long and makes an s-shaped curve. The sphincters of the bladder of the man surrounded by the prostate. In an enlarged prostate can be narrowed urethra.