Tiger1974
Forum Newbie
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Hi,
I have a question about the respiratory system. Right now, my class is going over the lung pressures. Can anybody explain the transmural pressure and the elastic recoil pressure and their relationship? I am really confused with those concepts. Thanks.
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| fox
Forum Guru
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| Leopard
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Transmural pressure literally means "pressure across the wall of any structure"
PTM (transmural pressure) = Pin - Pout
Pin = pressure inside the structure
Pout = pressure outside the structure
Now you can see if the pressure inside is
- more than that outside then PTM will be positive and structure tends to expand
- less than that outside then PTM will be negative and structure tends to collapse
In respiratory system this PTM has been given different names
- Transpulmonary pressure = alveolar pressure - intrapleural pressure
- Transthoracic pressure = intrapleural pressure - pressure on the body surface (atmospheric pressure )
- Trans-respiratory pressure = alveolar pressure - pressure on the body surface
Elastic recoil pressure is the pressure developed in the wall of the lung which has following properties
- It is always inward i.e collapsing
- It is the function of lung volume ie. more lung volume ,more elastic pressure ,less lung volume ,less elastic recoil pressure.
If Elastic recoil pressure < Transpulmonary pressure = lung is epanding (inspiration)
If Elastic recoil pressure > transpulmonary pressure = Lung is collapsing (expiration)
Best of luck
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| Tiger1974
Forum Newbie
Topics: 12
Posts: 18
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Thanks Leopart. I also appreciate your great explanations.
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