Returns to FRC (functional residual capacity).Using this mnemonic, you can simplify the order of the four types of respiratory failure as Shunting, increased CO2 (hypoventilation), Atelectasis, and Hypoperfusion. Results in increase of pressure since volume decreases. The intrapleural pressure is more negative (-8) and the Alveolar Pressure returns back to 0 by balancing with atmospheric pressure Expiration: relaxation of muscles. Under normal conditions this is about 500mL. Intrapleural pressure decreases less than 5 End of Inspiration: lung expands until alveolar pressure equals atmospheric. Increases the Volume, thus decreasing the pressure boyle's law. The Intrapleural Pressure = -5mmHg During Inspiration: Contraction of diaphragm. Alveolar Pressure = 0 since it's equal to atmospheric pressure. Before Inspiration: Neutral point of respiratory system.
If positive (greater than outside, then a net force is pushing against walls).
Transmurual Pressure Gradient: pressure gradient across any tube. Negative pressure wince outward recoil and inward recoil cause this. Intrapleural Pressure: Pressure inside the film of fluid between viceral pleura (attached to lung) and parietal pleura (attached to chest wall). The functional residual capacity is the point where the outward force counterbalances the inward recoil. as lung expands, recoil increases -as smaller, recoil decreases -always acts to collapse the lung Chest Wall Recoil: -Outward force of chest well. Lung Recoil: inward force created by elastic recoil properties of alveoli.
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