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How many nephrons are found in each human kidney?

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Human kidneys — renal system Diagram showing the location of the kidneys in the abdominal cavity and their attachment to major arteries and veins.

Each human kidney contains approximately 1,000,000 to 1,250,000 nephrons. These structures serve as the functional units of the kidney, responsible for filtering blood and producing urine through the processes of filtration, reabsorption, and secretion.123