What term describes the microscopic functional unit of the kidney responsible for filtration and urine formation?

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The nephron is the kidney’s microscopic processing unit for filtration and urine formation. It combines two parts: the renal corpuscle, which includes the glomerulus and Bowman's capsule where filtration begins, and the renal tubule, where reabsorption and secretion modify the filtrate to form urine. Filtration occurs as fluid leaks from the glomerular capillaries into Bowman's space, and as this filtrate moves through the renal tubule, essential substances are reabsorbed and wastes are secreted to create final urine. Because it integrates both filtration and tubular processing, the nephron best fits as the functional unit responsible for urine formation. The glomerulus alone is just the filtration site, the renal tubule handles processing, and the renal corpuscle is the filtration component within the nephron.