3.2.4. Measuring Lung Volumes

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  • Created by: shyde7
  • Created on: 19-05-16 15:25
What is a spirometer?
A device that measures the movement of air in and out of the lungs as a person breathes.
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What does a float-chamber spirometer consist of?
A chamber of air/medical-grade oxygen floating on a tank of water.
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What happens in during inspiration?
Air is drawn from the chamber so that the lid moves down.
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What happens during expiration?
Air returns to the chamber.
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Where would these movements be recorded?
On a data-logger.
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What happens to the carbon dioxide in the exhaled air?
The air is passed through a chamber of soda lime, which absorbs the carbon dioxide. This allows the measurement of oxygen consumption.
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What are the five precautions that should be taken when using a spirometer?
The subject should be healthy and asthma-free. The soda lime should be fresh and functioning. There should be no air leaks in the apparatus. The mouthpiece should be sterilized. The water chamber must not be overfilled.
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Can vital capacity be measured using a spirometer?
Yes
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Can residual volume be measured using a spirometer?
No.
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How can you measure vital capacity?
By taking a deep breath and expiring all air possible from the lungs in one breath.
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What three things does a person's vital capacity depend on?
The size of a person (particularly their height). Their age and gender. Their level of regular exercise.
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What is the usual vital capacity?
2.5-5.0 dm^3
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What happens to the vital capacity for trained athletes?
The may be higher.
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Where does residual volume reside?
In the airways and alveoli.
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What is the approximate residual volume?
1.5 dm^3
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When is tidal volume usually measured?
At rest.
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What might a typical tidal volume be?
0.5 dm^3
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What can we assume about the amount of carbon dioxide absorbed by the soda lime?
That it is equal to the volume of oxygen absorbed by the blood.
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How can be measure the rate of oxygen uptake?
By measuring the gradient of the decrease in volume.
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What is the unit when measuring oxygen uptake?
dm^3 s^-1
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How can you calculate breathing rate from a spirometer?
You should simply count the number of peaks each minute on the trace.
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What is the usual breathing rate at rest?
12-14 breaths per minute.
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What two things would increased oxygen uptake result from?
Increased breathing rate. Deeper breaths.
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Other cards in this set

Card 2

Front

What does a float-chamber spirometer consist of?

Back

A chamber of air/medical-grade oxygen floating on a tank of water.

Card 3

Front

What happens in during inspiration?

Back

Preview of the front of card 3

Card 4

Front

What happens during expiration?

Back

Preview of the front of card 4

Card 5

Front

Where would these movements be recorded?

Back

Preview of the front of card 5
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