The Figure Below Illustrates How the Nephron in a Human

question 60

Multiple Choice

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

• A)leaving the tubule by diffusion.
• B)being pumped out of the tubule by active transport.
• C)moving out of the tubule through osmosis.
• D)exiting the tubule via secretion.

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