Biology B3 1.6 Artificial breathing aids.

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There are many reasons why someone cannot get enough oxygen into their bloodstream, what do these include?
If the alveoli are damaged the surface area for gas exchange is reduced, if the tubes leading to the lungs are narrowed less air can be moved through them, if the person is paralysed their muscles will not work to pull the ribcage up and out.
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What is the 'iron lung'?
A breathing aid, in which the person lay with their chest sealed in a large metal cylinder.
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What was the 'iron lung' used for?
People with polio who were paralysed.
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How did the 'iron lung' work?
When air was drawn out of the cylinder the chest moved out and they breathed in. The vacuum formed inside the cylinder created negative pressure. Air was pumped back into the cylinder creating pressure on the chest, forcing air out of the lungs.
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What do breathing aids which force measure amounts of air into the lungs use?
Positive pressure.
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What can bags of air linked to masks do?
Force air down the trachea.
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What is are the advantaged of positive pressure aids?
They are often smaller, easier to manage in the home and can be linked to computers for control.
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**THINK ABOUT AND FIND OUT ABOUT DISADVANTAGED AND ADVANTAGES OF DIFFERENT TYPES OF ARTIFICIAL BREATHING AIDS*****
**THINK ABOUT AND FIND OUT ABOUT DISADVANTAGED AND ADVANTAGES OF DIFFERENT TYPES OF ARTIFICIAL BREATHING AIDS*****
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Card 2

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What is the 'iron lung'?

Back

A breathing aid, in which the person lay with their chest sealed in a large metal cylinder.

Card 3

Front

What was the 'iron lung' used for?

Back

Preview of the front of card 3

Card 4

Front

How did the 'iron lung' work?

Back

Preview of the front of card 4

Card 5

Front

What do breathing aids which force measure amounts of air into the lungs use?

Back

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