Which one of the following parts of the excretory system in humans acts as a countercurrent multiplier?
Correct answer: D. Loop of Henle
- A. Kidney
- B. Cortex
- C. Medulla
- D. Loop of Henle
Explanation
The loop of Henle functions as a countercurrent multiplier in the kidney's nephron. It creates a concentration gradient in the medulla by actively transporting ions out of the tubular fluid, enabling the kidney to concentrate urine efficiently.
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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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