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JAMB Biology 1983 Question 14

Question 14

Excretion

The kidneys of all vertebrates act as osmoregulators. This means that they

  1. A.keep the composition of the plasma constant
  2. B.regulate osmotic processes
  3. C.control the volume of blood entering the kidneys
  4. D.decrease the osmotic pressure of blood.
  5. E.increase the osmotic pressure of blood.
Show the answer and explanation

Answer: A (keep the composition of the plasma constant)

Explanation

Osmoregulation means keeping the water and salt content (and so the osmotic pressure) of the blood plasma constant. The kidneys do this by removing more or less water and salts.