Normal Intrapleural Pressure is Negative because:

1.	Normal Intrapleural Pressure is Negative because:
A.	Intrapulmonary Pressure is Negative
B.	Tranpulmonary Pressure is Negative
C.	The chestwall and lungs recoil in opposite directions
D.	The surfactant prevents pulmonary collapse
Answer» D. The surfactant prevents pulmonary collapse

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