The active uptake of sodium in the ascending limb or thick loop of Henle is promoted by the action of:
Correct answer: A. Aldosterone
- A. Aldosterone
- B. Thyroxine
- C. ADH (Antidiuretic hormone)
- D. Cortisone
Explanation
Aldosterone stimulates sodium reabsorption (active uptake) in the distal tubule and indirectly influences sodium handling in the thick ascending limb of Henle by promoting overall sodium retention in the nephron. (The primary driver of Na⁺/K⁺/2Cl⁻ cotransport in the thick ascending limb is the Na⁺/K⁺ ATPase energized by the electrochemical gradient, but aldosterone enhances sodium reabsorption in the distal segments.)
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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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The basic functional unit of the human kidney is:
Renal failure with complete lack of urine production is:
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Urine formation is the result of:
ADH, which actively transports water from the filtrate in collecting tubules back to the kidney is released by: