Sudden exposure to an atmospheric pressure of 100 mmHg (13 kPa), as mi

1.	Sudden exposure to an atmospheric pressure of 100 mmHg (13 kPa), as might occur with loss of aircraft cabin pressure at around 15000 m altitude, causes A. Rupture of the eardrums by outward bulging. B. The appearance of gas bubbles in joints and lungs. C. No serious fall in the alveolar oxygen pressure if the person is breathing pure oxygen. D. Expansion of gas in closed spaces in the body. E. Gradual loss of consciousness in 10–15 minutes due to hypoxia.
Answer» A. True Ambient pressure drops much faster than middle ear pressure. B. True This is a manifestation of decompression sickness. C. False More than half of the total alveolar pressure will be taken up by carbon dioxide and water vapour. D. True This must happen from Boyle’s law. E. False Sudden severe hypoxia of this order causes unconsciousness in less than a minute.

Sudden exposure to an atmospheric pressure of 100 mmHg (13 kPa), as might occur with loss of aircraft cabin pressure at around 15000 m altitude, causes A. Rupture of the eardrums by outward bulging. B. The appearance of gas bubbles in joints and lungs. C. No serious fall in the alveolar oxygen pressure if the person is breathing pure oxygen. D. Expansion of gas in closed spaces in the body. E. Gradual loss of consciousness in 10–15 minutes due to hypoxia.

Answer»

A. True Ambient pressure drops much faster than middle ear pressure.

B. True This is a manifestation of decompression sickness.

C. False More than half of the total alveolar pressure will be taken up by carbon dioxide and water vapour.

D. True This must happen from Boyle’s law.

E. False Sudden severe hypoxia of this order causes unconsciousness in less than a minute.

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