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Overview
Urine formation occurs in the nephron, the functional unit of the kidney. The process involves three key stages: filtration, reabsorption, and secretion.
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Filtered
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Reabsorbed
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Secreted
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Excreted
Legend
Blood / Plasma
Filtrate / Tubule
Glucose / Nutrients
Urea / Waste
Water Molecules
Na⁺ / Ions
Thin Ascending Limb
Thick Ascending Limb
Thin→Thick Transition
Speed