• The kidneys are a pair of bean-shaped organs just above the waist.
  • The function of the kidney is to filter blood and form urine.
  • They are part of the urinary system, which also includes the ureters, bladder, and urethra.
  • Nephrons are the structural and functional units of the kidneys.
  • A single kidney may have more than a million nephrons!
  • Each nephron acts as a tiny filtering plant.
  • It filters blood and forms urine in the following steps:
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