- A Glucose
- B Sodium
- C Uric acid
- D Phosphate
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Answer:
B
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Sodium is actively reabsorbed in the proximal tubule of the nephron, but the amount reabsorbed varies according to the body's needs. When there is an excess of sodium in the body, the kidney excretes it in the urine. Therefore, in normal circumstances, the concentration of sodium is highest in the urine among the given options. Glucose is typically not present in urine, as it is usually completely reabsorbed in the proximal tubule. Uric acid and phosphate are present in the urine but not as commonly as sodium.
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