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* 1. What are the two vital body systems? Select two boxes below.

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* 2. Where does gas exchange take place in the lungs?

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* 3. What gas causes the stimulus to breathe?

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* 4. What is the percentage of oxygen in expired air?

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* 5. What air spaces in the body are affected by diving? Please select all that apply.

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* 6. How do you equalise your middle ear with the ambient pressure during a dive descent? Please select all that apply.

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* 7. What tools can a diver use to avoid DCI? Select from below. Please select all that apply.

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* 8. What is the advantage to a BSAC Ocean Diver of using nitrox as a breathing gas instead of air?

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* 9. Is it safe to put nitrox into any diving cylinder?

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* 10. What must you always do shortly before diving with a cylinder containing nitrox?

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