During re-absorption, essential substances like glucose, amino acids, salts, and water are selectively re-absorbed from the initial filtrate back into the bloodstream. This process helps maintain the body’s balance of water and electrolytes while eliminating waste products.
How does the re-absorption process in nephrons contribute to urine formation?
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Reabsorption in nephrons is a crucial step in urine formation. After filtration in the glomerulus, the renal tubules reabsorb essential substances, such as water, glucose, and ions, back into the bloodstream. This process occurs mainly in the proximal convoluted tubule and the loop of Henle. As reabsorption reduces the volume and increases the concentration of the filtrate, the nephron ensures vital substances are retained in the body while eliminating excess waste. The balance between reabsorption and secretion in the tubules influences the composition of the final urine, allowing the kidneys to regulate water balance, electrolyte concentrations, and acid-base equilibrium.