Forces In the Lungs Flashcards
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1
Q
Force which keeps the lung open is called ?
Is the value of this force
A
Intra pleural pressure
-5 cm of Hg
2
Q
How is intrapleural pressure created
A
It is created by a balance between chest wall recoil and lung recoil
3
Q
Functions of intrapleural pressure
A
Keeps the lung open
Keeps the chest wall from expanding
4
Q
What is lung recoil
A
Tension that develops in the wall of the lung as it expands. It acts to collapse the lung
5
Q
Overall elastic recoil is produced by
A
Pulmonary elastic recoil and surface tension(>50%)
6
Q
Tpp is the main determinant of lung volume. What is it
A
Tpp is the pressure difference across the lungs
7
Q
The greater the tpp the … the lung volume
A
Greater
