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Ventilatory Mechanisms

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.

What is "Pa"?   Atmospheric Pressure: 760 mm Hg- at sea level  
What is "Pt"?   Intrathoracic/ Intrapleural Pressure: 3 mm Hg - pressure outside Lungs but IN chest  
What is "Palv"?   Intraalveolar Pressure - IN Lungs  
Which Ventilatory Pressures fluctuate?   Pt, Palv  
What happens to Ap in higher altitudes?   Ap DECREASES  
How does Inhalation take place?   Diaphragm contracts --> INCREASE Chest size --> DECREASE Pt --> Lungs EXPAND --> DECREASE Palv --> <Pa --> air flows IN  
How does Exhalation take Place?   Diaphragm relaxes --> DECREASE Chest size --> INCREASE Pt --> Lungs SHRINK --> INCREASE Palv --> > Pa --> air flow OUT  
What would be the result if Pt were ^ Ap?   lungs collapse --> Pulmonary Arrest  


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Created by: Kristel