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KIDNEY FUNCTIONS Urine Formation   Filtration Reabsorption Excretion Other Functions   Secretion                   REABSORBES VITAL SUBSTANCES THEREBY BALANCES BODY FLUIDS AND CHEMICALS Function of renal tubules Reabsorption depends on both active and passive transport mechanisms PCT—all organic nutrients totally reabsorbed, most of sodium, obligatory water reabsorption, solvent drag allows passive movement of solutes Transport maximum exists for every substance except sodium—when transport mechanisms saturated additional material not reabsorbed and eliminated in urine Non-reabsorbed substances lack carriers or cannot diffuse through tubule cells Loop of Henle—water and electrolytes DCT and collecting duct—reabsorption regulated by hormones (aldosterone, ADH, ANP)