The basic filtration unit in the kidneys is a cluster of very thin-walled blood capillaries associated with the cup-shaped end of a coiled tube called Bowman’s capsule.
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The basic filtration unit in the kidneys is the nephron. Nephrons consist of a renal corpuscle, comprising a glomerulus and Bowman’s capsule, and a renal tubule. The glomerulus is a network of capillaries where blood is filtered under high pressure. Bowman’s capsule surrounds the glomerulus, collecting the filtered fluid (filtrate). The renal tubule, consisting of proximal convoluted tubule, loop of Henle, and distal convoluted tubule, processes the filtrate by reabsorbing essential substances and secreting waste products. Nephrons play a vital role in filtering blood, regulating fluid and electrolyte balance, and forming urine in the kidneys.