The portion of the kidney that functions primarily in the active transport of sodium ions out of the renal tubule is the:

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The distal convoluted tubule is responsible for actively transporting sodium ions out of the renal tubule, which helps regulate the body's water balance and blood pressure. The proximal convoluted tubule also reabsorbs sodium, but through a different mechanism (passive transport). The glomerulus and Bowman's capsule are part of the renal corpuscle, which filters blood to produce urine. The renal vein is the blood vessel that carries filtered blood out of the kidney.

The Portion of the Kidney That Functions Primarily in the Active