Waec Model Questions Vol1 2019 Biology Question 33
Practice objective / multiple choice question 33 from the 2019 Waec Model Questions Vol1 Biology examination.
The diagram shows the human respiratory system. Identify the structure that is the principal site of gas exchange. Then, assuming each alveolus is a sphere with an internal diameter of 0.2 mm and the lungs contain about 4.8 × 10⁸ alveoli, calculate the total inner surface area available for diffusion. Give your answer in square metres, rounded to the nearest whole number.
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About This Question
This is Waec Model Questions Vol1 2019 Biology Question 33. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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