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Ventilatory Mechanic

Ventilatory Mechanisms

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
Created by: Kristel
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