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6. Partial reduction of what substance can cause chemical destruction of cells?

  • Helium
  • Hydrogen
  • Oxygen
  • Nitrogen

7. The expansion of air when a diver descends causes what unwanted danger?

  • Decompression sickness
  • Oxygen toxicity
  • Air embolism
  • Nitrogen narcosis

8. What law states that the greater the pressure, the more gas will dissolve into liquid?

  • Boyles
  • Fick
  • Henry
  • Dalton

9. As depth increases, what happens to PO2?

  • Increases
  • Decreases

10. Divers should not breathe in pure oxygen at depths more than what?

  • 7m
  • 2m
  • 5m
  • 10m

11. What type of diving is it when you swim underwater on one breath?

  • Saturation diving
  • Free diving
  • SCUBA diving

12. Using helium has what effect on breathing resistance?

  • Decreases
  • Increases

13. 1 ATA is equivalent to having how many miles of air above us?

  • 24
  • 28
  • 18
  • 26

14. Hyperventilation is a safe way of increases maximum breath hold time

  • False
  • True

15. What is the most common manifestation of the mammalian diving reflex?

  • Decreased blood pressure
  • Increased blood pressure
  • Bradycardia
  • Tachycardia

16. In saturation diving, divers live in steel chambers pressurised to what?

  • The depth at which they are working
  • Sea level
  • An intermediate pressure

17. What gets stretched during air embolisms?

  • Blood vessels
  • Alveolar membranes
  • Any cell membranes

18. What is PO2 at sea level?

  • 160mmHg
  • 479mmHg
  • 2280mmHg

19. Who's law says that as pressure increases, volume decreases?

  • Boyles
  • Coleslaw
  • Daltons
  • Henrys

20. Air embolisms can lead to a spontaneous pneumothorax

  • True
  • False