Gce Model Questions Vol1 2019 Biology Question 27

Practice objective / multiple choice question 27 from the 2019 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2019 Biology Objective / Multiple Choice Medium Difficulty
Question 27 GCE_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • objective

At sea level the barometric pressure is \(760\) mmHg. The partial pressure of water vapour in the alveoli is \(47\) mmHg and the inspired fraction of oxygen is \(0.21\). The arterial carbon‑dioxide pressure is \(40\) mmHg and the respiratory quotient is \(0.8\).\n\n(a) Using the alveolar gas equation, calculate the alveolar partial pressure of oxygen (\(P_{AO2}\)) at sea level.\n(b) At an altitude of 3000 m the barometric pressure falls to \(523\) mmHg while all other values remain unchanged. Calculate the new \(P_{AO2}\).\n(c) State the difference in \(P_{AO2}\) between sea level and 3000 m.

Answer Options

Correct Answer A. Sea‑level \(P_{AO2}\) ≈ 100 mmHg; at 3000 m ≈ 50 mmHg; difference ≈ 50 mmHg.
B. Sea‑level \(P_{AO2}\) ≈ 80 mmHg; at 3000 m ≈ 30 mmHg; difference ≈ 50 mmHg.
C. Sea‑level \(P_{AO2}\) ≈ 90 mmHg; at 3000 m ≈ 45 mmHg; difference ≈ 45 mmHg.
D. Sea‑level \(P_{AO2}\) ≈ 120 mmHg; at 3000 m ≈ 60 mmHg; difference ≈ 60 mmHg.
Correct Answer
A
Correct Option:
Sea‑level \(P_{AO2}\) ≈ 100 mmHg; at 3000 m ≈ 50 mmHg; difference ≈ 50 mmHg.

About This Question

This is Gce Model Questions Vol1 2019 Biology Question 27. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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