- A 10%
- B 1%
- C 70%
- D 99%
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Answer:
C
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The proximal convoluted tubule is responsible for about 70% of sodium reabsorption in the nephron. Sodium reabsorption in this segment occurs actively, meaning that it requires energy in the form of ATP to move sodium from the filtrate back into the bloodstream. This process is necessary to maintain the body's fluid balance and blood pressure. The remaining 30% of sodium is reabsorbed in the loop of Henle and the distal tubules.
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