The kidney of Marine water fish will reabsorb:
Correct answer: D. Water
- A. Salt
- B. Ammonia
- C. Urea
- D. Water
Explanation
Marine fish live in a hypertonic environment, meaning the surrounding water has a higher salt concentration compared to their body fluids. To maintain homeostasis and prevent dehydration, their kidneys are adapted to reabsorb water efficiently. This process helps conserve water, while excess salt is expelled mainly through the gills. Other substances such as salt, ammonia, and urea are not reabsorbed in the same manner as water. Salt is actively excreted, ammonia is a waste product directly excreted, and urea is not typically a focus in marine fish kidney reabsorption.
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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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