Which of the following best describes the correct function of peritubular capillaries?
Correct answer: D. Reabsorption of useful constituents
- A. Oxygen uptake from the kidney cells
- B. Supply of carbon dioxide to the kidney cells
- C. Reabsorption of urea
- D. Reabsorption of useful constituents
Explanation
Peritubular capillaries surround the renal tubules and take back the useful substances reabsorbed from the filtrate, such as glucose, amino acids, salts and water. Reabsorption of urea is the tempting choice, but urea is mostly left in the filtrate to be excreted, and gas exchange is not their defining function.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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