1. What happens to the composition of air with increasing altitude?
It remains the same
2. What is carboxyhaemoglobin?
Carbon monoxide bound to haemoglobin
3. Hundred percent of O2 is considered to be toxic to body functions. What is the toxicity due to?
The production of superoxide anion, a free radical and H2O2
4. When hypocapnoea may develop in a normal person?
By following hyperventilation
5. What is the cause of death in drowning?
Asphyxia
6. What is temporary cessation of breathing called?
Apnoea (apnea)
7. Healthy infants may be found dead in their cribs due to sleep apnoea. What is this condition called?
Sudden infant death syndrome (SIDS)
8. What is the alternative name of nitrogen narcosis?
Caison’s disease / Rapture of the deep
9. How the problems of nitrogen narcosis can be avoided in deep-sea divers?
By breathing mixtures of oxygen and Helium
10. What is air embolism occurring as a result of rapid expansion of the gas in the lungs when the external pressure is suddenly reduced to sub-atmospheric levels called?
Explosive decompression.
( UMS, 2008 )
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