Which of the following is the correct statement?
Correct answer: D. The ascending limb of loop of Henle is impermeable to water.
- A. The descending limb of loop of Henle is impermeable to water.
- B. The ascending limb of loop of Henle is permeable to water.
- C. The descending limb of loop of Henle is permeable to electrolytes.
- D. The ascending limb of loop of Henle is impermeable to water.
Explanation
The key difference between ascending and descending loop of Henle is that the ascending loop of Henle is the thicker segment of the loop of Henle located just after the sharp bend of the loop while descending loop of Henle is the thinner segment located just before the sharp bend of the loop. The descending limb of the loop of Henle is permeable to water. Water diffuses into the hyperosmolar medullary interstitium. The osmolarity can reach a maximum of 1200 mOsm/L at the tip of the medullary interstitium in antidiuresis. The ascending limb (where loop diuretics work) is impermeable to water.
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About Homeostasis
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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