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the same reason blue is blue and Martha Stewart is Martha Stewart
(We don't know why we just name things)
Another answer: According to the Online Etymology Dictionary the word 'kidney' is of unknown origin, originally 'kidenere', perhaps a compound of Old English 'cwid' (womb) plus 'ey' (egg), in reference to it's shape.
What else can I help you with?
What are the tubes called inside the kidneys?
The tubes from the kidneys to the bladder are called ureters.
Why are kidneys called kidneys?
The shape of your kidneys resemble the shape of the kidney bean.
Are the nitrogenous wastes gotten rid of through the organs called the kidneys?
kidneys
What are the two narrow tubes in the kidneys called?
The two narrow tubes in the kidneys are called ureters. They carry urine from the kidneys to the bladder for storage before it is eliminated from the body.
What are your blood filters called?
Kidneys
What are the complex filtering organs of the vertebrates called?
Complex filtering organs in the back of the body are kidneys.
What are changes in kidneys or lungs called?
Metabolic
What are filter sacs in the kidneys called?
Glomerulus
What is the filtering factories in the kidneys?
It is called "Nephron".
What are the arteries and veins called that service the kidneys of a frog?
Renal arteries and veins service an animal's kidneys.
When kidneys loose ability to filter blood what is it called?
Renal failure is the loss of function of the kidneys.
How the kidneys remove wastes and keep fluids and salts in balance.?
First blood is carried into the kidneys by the renal artery anything in the body related to the kidneys is called renal
