Active learning 9

Question 1

A diver descends to 40 metres below sea level while breathing from a tank containing compressed air. At this depth, the approximate partial pressure of nitrogen in the air mixture will be?

Answer 1

2960 mmHg

Question 2

At rest at sea level the difference in between the partial pressure of oxygen in the arterial and venous blood is?
100mmHg

40mmHg

33mmHg

60mmHg

Answer 2

60mmHg

Question 3

In free diving, deep-water blackout is a potential problem. Which of the following statements is the most likely explanation:

A rapid drop in cerebral oxygen supply during ascent

The diffusion of carbon dioxide from the lungs into the body during descent

Large increase in the partial pressure of oxygen in the lungs during descent

Increases in blood carbon dioxide levels stimulating the respiratory centre

Answer 3

A rapid drop in cerebral oxygen supply during ascent

Question 4

The role of the regulators in standard SCUBA equipment is to?

Answer 4

Reduce the pressure of the gas inhaled to ambient pressure

Question 5

Nitrogen Narcosis is the result of?

High nitrogen concentrations in the lipid bilayer creating an anaesthetic effect

Present at depths of 10 m

Independent of dive time and depth

The result of bubble formation in the brain during the ascent from depth

Submit

Answer 5

High nitrogen concentrations in the lipid bilayer creating an anaesthetic effect

Question 6

Which of the following statements about oxygen toxicity is TRUE?

Is the result of hyper saturation of haemoglobin in the blood

Produces symptoms similar to being drunk

Can be linked to increases in free radical concentrations

Causes seizures and coma when briefing air at a depth of 40m