How many nephrons are in each human kidney?
Quick Answer
Each human kidney contains about 1 million nephrons, though the number varies from person to person. Nephrons are the microscopic units that filter blood and make urine.
The Full Story
A human kidney contains roughly 1 million nephrons, the tiny filtering units that do the organ’s core work. Each nephron includes a glomerulus for filtration and a long tubule that adjusts water, salts, and wastes before urine is formed. Together, nephrons maintain fluid balance, electrolyte levels, and acid-base balance in the body. Not all nephrons are identical in structure or length, but they all contribute to filtration. Loss of nephron function is a major feature of chronic kidney disease.
Key Facts
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"Inside each kidney are a million tiny filters doing all the hard work."
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