The Kidney — Selective Filtration & Water Reclamation The kidney is one of the body’s most precise and efficient filtration systems, working tirelessly to keep the internal environment balanced. Each kidney contains over a million nephrons, and every nephron begins its work at the glomerulus, a microscopic filter where blood is pushed under pressure. Here, water, salts, and small waste particles pass through, while crucial components like proteins and blood cells remain protected in circulation.

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