Igcse Model Questions Vol1 2018 Biology Question 28
Practice objective / multiple choice question 28 from the 2018 Igcse Model Questions Vol1 Biology examination.
The labelled diagram of the human respiratory system shows that the total internal surface area of all alveoli is about 70 m² and that the average internal surface area of a single alveolus is 0.07 mm². It also indicates a tidal volume of 0.5 L per breath and that 60 % of this volume reaches the alveoli (alveolar ventilation fraction). Calculate (a) the approximate total number of alveoli in the lungs, and (b) the volume of air that reaches the alveoli in each breath (in litres, to two decimal places).
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About This Question
This is Igcse Model Questions Vol1 2018 Biology Question 28. It is one of the objective questions from the 2018 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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