It consists of:
- Two kidneys that produce urine.
- The left and right ureters that the urine travels through on leaving the kidneys.
- The muscular urinary bladder, which receives the urine from the ureters and temporarily stores it.
- The tube called the urethra through which urine passes from the bladder out of the body.
- The working unit of the kidneys is the nephron, composed of a nephron tubule, its associated blood vessels, and the interstitial fluid in which both are immersed.