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Urine when compared with blood in mammals is hypertonic because

Biology
WAEC 2025

Urine when compared with blood in mammals is hypertonic because

  • A. urine contains high percentage of all cells
  • B. all traces of sugar have been removed from urine
  • C. urea is actively secreted into the renal tubules
  • D. much water has been removed from urine
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Correct Answer: Option D
Explanation

Urine is considered hypertonic (more concentrated) relative to blood in mammals because the kidneys reabsorb a significant volume of water back into the bloodstream during the process of urine formation. This concentration occurs primarily in the Loop of Henle and the collecting ducts, where water is removed from the filtrate while solutes like urea and salts are retained. This mechanism allows mammals to conserve water and excrete waste efficiently. 


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