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Kidney Anatomy(Diagram) Kidneys are excretory organs belonging to the urinary system that weighs around 150 grams, about the size of a standard computer mouse. They are two-bean shaped structures located right above your waistline.
Kidneys and Protein. Kidneys are bean-shaped organs in your lower back -- one is on your right side and one is on your left. Nephrons are structures inside each kidney that contain tiny tubes called glomeruli. These glomeruli are responsible for filtering your blood to remove waste products and fluid to produce urine. Kidney damage allows protein to pass through the glomeruli and move into your urine.