Igcse Model Questions Vol1 2022 Biology Question 5

Practice objective / multiple choice question 5 from the 2022 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2022 Biology Objective / Multiple Choice Medium Difficulty
Question 5 IGCSE_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • objective

At sea level atmospheric pressure is 760 mmHg and the fraction of inspired O₂ is 0.21. Water vapour pressure in the alveoli is 47 mmHg, alveolar CO₂ partial pressure is 40 mmHg and the respiratory quotient R is 0.8. Using the alveolar gas equation \(PAO₂ = FiO₂(P_{atm} - P_{H₂O}) - \frac{PaCO₂}{R}\), calculate (a) the alveolar partial pressure of O₂ (PAO₂) in mmHg, (b) the O₂ gradient between alveolar air and arterial blood if arterial PO₂ is 95 mmHg, and (c) the percentage of alveolar O₂ that is transferred to the blood.

Answer Options

A. PAO₂ ≈110 mmHg; gradient 15 mmHg; 85 % of alveolar O₂ transferred
B. PAO₂ ≈105 mmHg; gradient 10 mmHg; 90 % of alveolar O₂ transferred
C. PAO₂ ≈95 mmHg; gradient 0 mmHg; 100 % of alveolar O₂ transferred
Correct Answer D. PAO₂ ≈100 mmHg; gradient 5 mmHg; 95 % of alveolar O₂ transferred
Correct Answer
D
Correct Option:
PAO₂ ≈100 mmHg; gradient 5 mmHg; 95 % of alveolar O₂ transferred

About This Question

This is Igcse Model Questions Vol1 2022 Biology Question 5. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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