Select the part of nephron which is NOT permeable to water and stops its outflow:
Correct answer: C. Ascending loop
- A. Glomerulus
- B. Proximal Tubule
- C. Ascending loop
- D. Descending loop
Explanation
The ascending loop is only permeable to salt ions such as Cl- and Na+. The descending loop, on the other hand, is permeable to water. The idea behind the impermeability of the ascending loop is to allow salts to move out of the loop of Henle via active transport so they can be reabsorbed.
This question appeared on the UHS MDCAT 2017 paper, which you can sit online with every answer explained.
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The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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