Measuring LUNG capacity

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  • Created by: Steff06
  • Created on: 14-03-16 12:17
What is breathing controlled by?
The diaphragm and intercostal muscles contracting and relaxing.
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What does breathing bring in and remove?
Bring in oxygen rich air into the lungs and expels carbon dioxide out of the body.
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Define tidal volume
The volume of air moved in and out of the lungs with each breath when at rest.
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What is the normal tidal volume and what does it allow?
Around 0.5dm3 and it provides the body with enough oxygen for its resting needs and removes enough CO2 to a safe level.
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Define vital capacity
The largest volume of air that can be moved into the lungs in one breath.
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What is the vital capacity and what are factors which affect it?
5dm3. Varies between men and women, age and size alter it and regular exercise increases vital capacity.
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What is residual volume?
Volume of air that always remains in the lungs even after the biggest possible exhalation.
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What is the normal residual volume?
1.5dm3
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Define inspiratory reserve volume
How much more air can be breathed in over and above normal tidal volume when you take a big deep breath.
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When do you call on this reserve?
When exercising.
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What is dead space?
The air in the bronchioles, trachea and bronchi. No gas exchange between this air and blood.
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Define expiratory reserve volume
How much more air can be breathed out over and above amount breathed in a tidal volume breath.
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What is a spirometer?
A chamber filled with oxygen that floats on a tank of water.
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How does the person use the spirometer?
They breathe from a disposable mouth piece attached to a tube connected to the chamber of medical-grade oxygen.
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How can the person be asked to breathe?
Asked to breathe normally at rest, take deep breaths or exercise so different patterns of breathing can be shown.
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Describe the process of using a spirometer
Breathing in takes oxygen from the chamber which makes it sink down. Breathing out pushes air into the chamber which then floats up.
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How are movements recorded?
On a datalogger so a spirometer trace can be produced.
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What can happen if a person breathes in and out of a spirometer for a long period of time?
CO2 levels will increase to a dangerous level.
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How can this be avoided?
By using soda lime to absorb the CO2 that is exhaled so the total volume of gas in the spirometer will go down.
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What is the volume of carbon dioxide breathed out equal to?
The volume of oxygen breathed in.
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Other cards in this set

Card 2

Front

What does breathing bring in and remove?

Back

Bring in oxygen rich air into the lungs and expels carbon dioxide out of the body.

Card 3

Front

Define tidal volume

Back

Preview of the front of card 3

Card 4

Front

What is the normal tidal volume and what does it allow?

Back

Preview of the front of card 4

Card 5

Front

Define vital capacity

Back

Preview of the front of card 5
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