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Excretion is the removal of from the body. The body's excretionary organs are the , the lungs and the kidneys.
The skin excretes water and salts as .
The lungs excrete carbon dioxide and .
The kidneys excrete water, salts and .
The urinary system consists of kidneys, arteries and veins, ureters, bladder and urea. Blood enters the kidneys through the renal artery where , salts and urea are removed and form urine. The urine then passes to the via the . In the bladder, the urine is stored until it is removed from the body via the .
The kidneys also control the amount of in the body.