What is hypoxia?

• A. A lack of oxygen to the brain, leading to impaired judgment, dizziness, and other symptoms.
• B. A condition of excessive oxygen in the blood
• C. A minor nasal congestion
• D. A psychological fear of flying

Answer: (A)

Hypoxia is a lack of oxygen reaching the body's tissues, with the brain being especially sensitive. When oxygen delivery drops, cognitive functions and balance deteriorate, causing impaired judgment, dizziness, headache, and confusion. In flight, hypoxia can occur at altitude or with poor cabin pressurization because the available oxygen is not enough to meet the brain's needs. The other choices describe different situations: having too much oxygen in the blood is hyperoxia, nasal congestion doesn't reflect oxygen transport, and a fear of flying is a psychological condition not related to oxygen levels.