Neco 2023 Biology Question 13

Practice objective / multiple choice question 13 from the 2023 Neco Biology examination.

Neco 2023 Biology Objective / Multiple Choice Medium Difficulty

Question 13 NECO • 2023 • BIOLOGY • objective

At sea level (atmospheric pressure \(P_{atm}=760\) mmHg) the water vapour pressure is 47 mmHg. A person breathes air with a fractional oxygen concentration \(F_{IO2}=0.21\). Their arterial carbon‑dioxide tension is \(P_{aCO2}=40\) mmHg and the respiratory quotient is \(R=0.8\). Using the alveolar gas equation, calculate the alveolar oxygen tension \(P_{AO2}\). If the measured arterial oxygen tension is 80 mmHg, determine the A‑a gradient and state whether it indicates a diffusion impairment (gradient > 15 mmHg).

A. 5 mmHg, No

Correct Answer B. 20 mmHg, Yes

C. 30 mmHg, Yes

D. 10 mmHg, No

Correct Answer

Correct Option:

20 mmHg, Yes

This is Neco 2023 Biology Question 13. It is one of the objective questions from the 2023 Neco Biology examination.

Difficulty level: Medium .

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