MCAT Biology Question 138: Answer and Explanation
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Question: 138
3. Which region of the kidney has the lowest solute concentration under normal physiological circumstances?
- A. Cortex
- B. Outer medulla
- C. Inner medulla
- D. Renal pelvis
Correct Answer: A
Explanation:
The region of the kidney that has the lowest solute concentration is the cortex, where the proximal convoluted tubule and a part of the distal convoluted tubule are found. The solute concentration increases as one descends into the medulla, and concentrated urine can be found in the renal pelvis.