Two counter-current systems are formed in the kidney by the:
Correct answer: D. Henle's loop and vasa rectae
- A. Henle's loop and PCT
- B. Henle's loop and DCT
- C. Henle's loop and collecting duct
- D. Henle's loop and vasa rectae
Explanation
Henle's loop and the vasa recta, which are specialized capillaries that run parallel to the loop of Henle, form counter-current systems. This arrangement allows for the maintenance of the osmotic gradient in the kidney medulla, crucial for water reabsorption and urine concentration.
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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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