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JAMB Biology 2005 Question 21

Question 21

Excretion

The urinary tubules of the kidney function through

  1. A.osmosis and diffusion
  2. B.active transport and osmosis
  3. C.ultrafiltration and selective reabsorption
  4. D.active transport and cytoplasmic streaming
Show the answer and explanation

Answer: C (ultrafiltration and selective reabsorption)

Explanation

Blood is filtered under pressure in the Bowman's capsule (ultrafiltration). Useful substances are then taken back into the blood along the tubule (selective reabsorption).