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Which form of hypoxia is most common during unpressurized flight at altitude?

Choices

  • ✓ Hypoxic hypoxiacorrect

    Reduced pressure at altitude lowers available oxygen, causing hypoxic hypoxia.

  • Histotoxic hypoxia

    Histotoxic hypoxia is caused by substances like alcohol impairing cells, not altitude itself.

  • Stagnant hypoxia

    Stagnant hypoxia results from poor blood flow, not reduced pressure.

  • Hypemic hypoxia

    Hypemic hypoxia results from the blood being unable to carry oxygen, as in CO poisoning.

Why

At altitude, the reduced atmospheric pressure lowers the oxygen available to the lungs, producing hypoxic hypoxia, the most common form in flight.

FAA source: PHAK Ch. 17 / hypoxiabrowse the reference library →

This is taught in Oxygen and the Gases That Hurt You: Hypoxia, Hyperventilation and CO — study the lessons free, then practice with grading and mastery tracking.

Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question.

Which form of hypoxia is most common during unpressurized flight at a… · PPL Free Ground School