The portion of a nephron considered the most metabolically active and that is involved in the reabsorption of 60% to 80% of the glomerular filtrate and that secretes 90% of hydrogen ion excreted by the kidney is the:

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The portion of the nephron that is most metabolically active and responsible for reabsorbing 60% to 80% of the glomerular filtrate and secreting 90% of hydrogen ions excreted by the kidney is the proximal tubule. The glomerulus only filters blood, the loop of Henle is responsible for concentration and dilution of urine, and the distal tubule is responsible for fine-tuning electrolyte balance and pH.

The Portion of a Nephron Considered the Most Metabolically Active