Proper functioning of the human kidney requires considerable active transport of sodium in the kidney tubules. If these active transport mechanisms were to stop completely, how would urine production be affected?
A. A greater-than-normal volume of urine equal in concentration to the blood (isotonic) would be produced.
B. A greater-than-normal volume of urine that was more concentrated than the blood (hypertonic) would be produced.
C. A lower-than-normal volume of urine which was less concentrated than the blood (hypotonic) would be produced.
D. A lower-than-normal volume of urine which was more concentrated than the blood (hypertonic) would be produced.
E. No urine would be produced.
Answer: A
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