ATPL 040 Human Performance Practice Questions - EASA ATPL Theory - Human Performance And Limitations (040) Exam

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Even though total atmospheric pressure decreases with altitude, the percentage of oxygen in the air remains constant. Therefore, the reason a pilot becomes hypoxic at altitude is principally that:

Carbon dioxide concentration rises sharply with altitude The percentage of oxygen in the air falls below 21% The partial pressure of oxygen falls, reducing oxygen uptake in the lungs Nitrogen replaces oxygen in the alveoli

Correct Answer:

The partial pressure of oxygen falls, reducing oxygen uptake in the lungs

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