I don't know that they're the main organs, but kidneys are certainly essential to the urinary system.
The kidney is part of the urinary system, which consists of the kidneys, ureters, urinary bladder, and urethra.
kidneys and bladder
kidneys
The kidneys are organs. They belong to the excretory (organ) system.
the heart is part of the circulatory system in the body.
Yes.
Kidneys
Kidneys - Urinary System
Yes, the bladder and the kidneys are part of an organ system.
It's excretory system. The system's main organ is pair of kidneys.
Kidneys
Both kidneys and the liver, along with many lymph nodes.
The kidneys
The kidney is part of the urinary system, which consists of the kidneys, ureters, urinary bladder, and urethra.
The kidneys are the principal organ.
Kidneys
kidneys and bladder