kidney

ureter
bladder
urethra

Kidney: The kidney is an organ responsible for filtering waste products, excess water, and other substances from the bloodstream. It plays a crucial role in maintaining the balance of fluids and electrolytes in the body.

Ureter: Ureters are long, tube-like structures that connect the kidneys to the bladder. Their main function is to transport urine from the kidneys to the bladder for storage before it is eliminated through the urethra.

Bladder: The bladder is a muscular organ that stores urine until it is ready to be expelled from the body. It expands and contracts as urine fills and is released from it.

Urethra: The urethra is a tube that carries urine from the bladder to the outside of the body during urination. In males, it also serves the additional function of transporting semen during ejaculation.