When water is in short supply, increased water retention occurs through the:
Correct answer: C. Juxtamedullary nephrons
- A. Cortical nephrons
- B. Proximal Convoluted Tubule
- C. Juxtamedullary nephrons
- D. The tissue of cortex
Explanation
Juxtamedullary nephrons have long loops of Henle that extend deep into the medulla, enabling them to create a strong osmotic gradient for water reabsorption and conserve water when the body is dehydrated. Cortical nephrons have shorter loops and are less involved in water conservation.
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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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