The blood vessels that surround the loop of the nephron are called peritubular capillaries. In the renal system, peritubular capillaries are small blood vessels,
supplied by the efferent arteriole, which travels along the nephrons allowing reabsorption and secretion between the blood and the inner lumen of the nephron. Nephrons: Blood from the renal artery flows into small filters in the kidneys called nephrons. Glomeruli: Clusters of tiny blood vessels in each nephron (the glomeruli) allow waste and water to move into the tubules, which filter impurities. The long nephron loops of the juxtamedullary nephrons lie in the renal medulla. These countercurrent mechanisms establish and maintain an osmotic gradient that extends from the cortex through the depths of the medulla. nephroni) is the portion of a nephron that runs from the proximal convoluted tubule to the distal convoluted tubule.
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