Which flight level has the shortest Time of Useful Consciousness?

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Multiple Choice

Which flight level has the shortest Time of Useful Consciousness?

Explanation:
Time of Useful Consciousness is how long you can stay conscious when oxygen in the air is insufficient, as happens with increasing altitude. As you climb, atmospheric pressure falls, so the partial pressure of oxygen in the lungs drops even though the oxygen percentage stays about the same. The brain is very sensitive to reduced oxygen, so consciousness and decision-making deteriorate much faster at higher altitudes. Therefore, the higher the flight level, the shorter the TUC. Among the options, the highest flight level has the shortest TUC, since the brain receives the least oxygen there without supplemental oxygen.

Time of Useful Consciousness is how long you can stay conscious when oxygen in the air is insufficient, as happens with increasing altitude. As you climb, atmospheric pressure falls, so the partial pressure of oxygen in the lungs drops even though the oxygen percentage stays about the same. The brain is very sensitive to reduced oxygen, so consciousness and decision-making deteriorate much faster at higher altitudes. Therefore, the higher the flight level, the shorter the TUC. Among the options, the highest flight level has the shortest TUC, since the brain receives the least oxygen there without supplemental oxygen.

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