No, a nephron is not an organ. It is the basic structural and functional unit of the kidney and filters excess salt and water from the blood. The kidney is the main organ of the urinary system. Without a kidney, your body cannot create urine and you blood must be filtered with a dialysis machine.
Yes the kidney is the main organ in the urinary system as well as the bladder.
Kidneys
Kidneys - Urinary System
I don't know that they're the main organs, but kidneys are certainly essential to the urinary system.
Both kidneys and the liver, along with many lymph nodes.
The main organ in the excretory system is the kidney. The kidney is the main organ that controls the excretory systems for vertebrates. It is also part of the Urinary system which is part of the excretory system.
The main organ of the urinary system is kidneys. (The ureters seems to be least important. Till kidney stone enters these tubes. Then you forget every thing and demand the relief from the pain. The kidneys will be damaged due to over dilatation if the tubes are blocked for long time.)
The main filtration structure of the urinary system is the nephron, which is found in the kidneys. Each nephron consists of a renal corpuscle (glomerulus and Bowman's capsule) where blood is filtered, and a renal tubule where reabsorption and secretion of substances takes place. The nephrons work together to filter waste products from the blood and regulate the balance of water and electrolytes in the body.
the main organ of the muscular system is the muscles
the heart is part of the circulatory system in the body.
The Heart is the main organ of a circulatory system.
The main organ in the muscular system is the muscles.