Which one of the following enables the mammalian kidney to regulate water reabsorption during states of dehydration?
Correct answer: D. Hormones increase the permeability of the collecting ducts
- A. The cells of the tubules detect the osmotic pressure of the blood
- B. Water is extracted from the glomerular filtrate in the proximal tubule
- C. The kidney produces hyptonic urine
- D. Hormones increase the permeability of the collecting ducts
- E. A low solute concentration is maintained around the collecting ducts
Explanation
Option D is correct.Water excretion by the kidney is regulated by the peptide hormone vasopressin. Vasopressin increases the water permeability of the renal collecting duct cells, allowing more water to be reabsorbed from collecting duct urine to blood.
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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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