Ocean Diver Knowledge: OT2: The body and the effects of diving

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

Respiratory

Reproductive

Circulatory

Endocrine

Lymphatic

Skeletal

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

sinuses

alveoli

bronchi

blood

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3. What gas causes the stimulus to breathe?

nitrogen

oxygen

helium

carbon dioxide

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

1.7%

20%

17%

15%

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

sinuses

teeth

lungs

middle ear

gut

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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.

holding your breath

gently breathing against a pinched nose

gently swallowing

suck a mint

there is nothing you can do

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

mask

dive computers

choice of breathing gas

torch

decompression tables

knife

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

Greater safety against DCI

Cheaper

nitrox is lighter than air

safer on the environment

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

Yes

Doesn't matter

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

Ensure the cylinder is marked correctly

Tell your dive buddy you are using nitrox

Analyse and record the mix and MOD

Clean the cylinder with fresh water

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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.

Question Title

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

Question Title

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

Question Title

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

Question Title

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

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

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

3. What gas causes the stimulus to breathe?

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

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

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

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

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

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

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