The kidney is part of the urinary system, which consists of the kidneys, ureters, urinary bladder, and urethra.
kidneys and bladder
kidneys
I don't know that they're the main organs, but kidneys are certainly essential to the urinary system.
The kidneys are organs. They belong to the excretory (organ) system.
The endocrine system.
Kidneys are part of the excretory system.
Yes, the bladder and the kidneys are part of an organ system.
The kidneys (paired).
The Stem
The kidneys
The kidneys are the principal organ.
kidneys and bladder
Kidneys
kidneys
The kidneys produce urine.
The kidneys process the urine and the bladderholds it.
kidneys