Atmosphere and respiration · Question 11 of 12
Approximately how long does a healthy person sitting still remain usefully conscious after a sudden loss of oxygen at 25 000 ft?
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Answer
- B About 3 to 5 minutes
Explanation
The time of useful consciousness decreases sharply with altitude: at 18 000 ft about 20 to 30 minutes, at 25 000 ft only about 3 to 5 minutes, at 35 000 ft less than a minute. Physical exertion, smoking and fatigue shorten it further.