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Ventilatory Mechanic
Ventilatory Mechanisms
Question | 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 |