Neco 2025 Biology Question 50
Practice objective / multiple choice question 50 from the 2025 Neco Biology examination.
The diagram shows the human respiratory system with parts labelled as follows: A - Nasal cavity, B - Pharynx, C - Larynx, D - Trachea, E - Bronchi, F - Alveoli, G - Diaphragm. During normal sea‑level breathing, the fraction of inspired oxygen (FiO₂) is 0.21, atmospheric pressure (Patm) is 760 mmHg, water vapour pressure (PH₂O) in the alveoli is 47 mmHg, arterial carbon‑dioxide partial pressure (PaCO₂) is 40 mmHg and the respiratory quotient (R) is 0.8. Using the alveolar gas equation \( PAO_2 = F_{iO_2}(P_{atm} - P_{H_2O}) - \frac{P_{aCO_2}}{R} \), calculate the alveolar partial pressure of oxygen (PAO₂) in mmHg (round to the nearest whole number).
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About This Question
This is Neco 2025 Biology Question 50. It is one of the objective questions from the 2025 Neco Biology examination.
Difficulty level: Medium .
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