Final answer:
The structures of the excretory system are the kidney, ureter, bladder, and urethra.
Step-by-step explanation:
The structures of the excretory system are the kidney, ureter, bladder, and urethra. The kidney filters waste products from the blood and produces urine, which is then transported to the bladder through the ureter. The bladder stores urine until it is expelled from the body through the urethra.
Learn more about excretory system