Hypoxia is defined as ...

Hypoxia is defined as ...

• A. A deprivation of oxygen to the brain that can reduce alertness, cause fatigue and dizziness, and in more extreme cases unconsciousness and even death.
• B. An excess of oxygen in the brain causing hyperactivity.
• C. Low cabin temperature.
• D. Dehydration at high altitude.

Answer: (D)

Hypoxia means not enough oxygen reaching the body's tissues. When altitude reduces the amount of oxygen available in the air, the brain and other organs may receive insufficient oxygen. This can slow thinking, cause fatigue, dizziness, and in more severe cases lead to unconsciousness or death. That’s why the description of hypoxia focuses on a lack of oxygen delivery to the tissues, particularly the brain, and the associated symptoms. The other conditions aren’t what hypoxia describes: an excess of oxygen in the brain would be oxygen toxicity, not hypoxia; low cabin temperature is a cold exposure issue, and dehydration is a fluid balance problem.

Hypoxia means not enough oxygen reaching the body's tissues. When altitude reduces the amount of oxygen available in the air, the brain and other organs may receive insufficient oxygen. This can slow thinking, cause fatigue, dizziness, and in more severe cases lead to unconsciousness or death. That’s why the description of hypoxia focuses on a lack of oxygen delivery to the tissues, particularly the brain, and the associated symptoms.

The other conditions aren’t what hypoxia describes: an excess of oxygen in the brain would be oxygen toxicity, not hypoxia; low cabin temperature is a cold exposure issue, and dehydration is a fluid balance problem.