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JAMB Biology 1990 Question 28

Question 28

Excretion

Use the figure (a kidney tubule) to answer: If the blood is too concentrated, more water is absorbed from

Diagram for this question
  1. A.5
  2. B.4
  3. C.3
  4. D.1
Show the answer and explanation

Answer: B (4)

Explanation

When the blood is too concentrated, ADH makes the tubule and collecting duct walls reabsorb more water; the tubule is the part labelled 4.