The figure below illustrates how the nephron in a human kidney aids in the removal of toxic by-products of protein metabolism and assists in the regulation of internal water and solute concentrations.
In the region of the nephron labeled "tubule," sodium is

Question

The figure below illustrates how the nephron in a human kidney aids in the removal of toxic by-products of protein metabolism and assists in the regulation of internal water and solute concentrations. 
In the region of the nephron labeled "tubule," sodium is

Quizplus · Accepted Answer

The region of the "tubule" in the nephron is responsible for the reabsorption of vital ions, such as sodium, from the filtrate back into the bloodstream via active transport. Therefore, sodium is being pumped out of the tubule by the Na+/K+ ATPase pump located on the basolateral membrane of the tubular cells, which requires energy in the form of ATP.

The Figure Below Illustrates How the Nephron in a Human