The kidneys are two reddish-brown bean-shaped organs found in vertebrates. They are located on the left and right in the retroperitoneal space, and in adult humans are about 12 centimeters (4+1⁄2 inches) in length.

Human kidney

by payoman

Human kidney

by payoman

The kidneys are two reddish-brown bean-shaped organs found in vertebrates. They are located on the left and right in the retroperitoneal space, and in adult humans are about 12 centimeters (4+1⁄2 inches) in length.

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