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WAEC Biology 2003 Question 13

Question 13

Respiration

Which of the following structures of the human body provides the best surface for diffusion?

  1. A.Skin
  2. B.Stomach
  3. C.Alveolus
  4. D.Oesophagus
Show the answer and explanation

Answer: C (Alveolus)

Explanation

Alveoli are very many, thin-walled, moist and surrounded by capillaries, giving a huge surface for gases to diffuse.