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13 Cards in this Set
- Front
- Back
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What in the lung & chest wall system influences the work of breathing & distillation of inspired gas? |
Static and dynamic characteristics |
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Elasticity |
Is the tendency of an object to return to its original shape after being deformed |
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What is the normal lung & chest wall recoil want to do? |
-lungs want to recoil inward, away from chest wall -thorax (chest wall) has a tendency to go outward, away from lung |
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What do the pleural membrane pressure do as lungs and Chest Wall go in opposite directions? |
Decreases (subatmospheric) |
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What is the atmospheric pressure at sea level |
760 mm hg |
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Ppl - intrapleural pressure Pao - opening airway pressure Pbs - body surface pressure Pa - alveolar pressure |
Pressures |
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What does the pressure at the mouth to atmospheric pressure? |
Always equal |
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During relaxation after exhalation and before next inhalation what is the Pa? |
Equal to atmospheric = 760 mm hg (Pao) |
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What are pressure gradients? What are they responsible for? |
-Pressure differences between 2 points that cause air to move in/out of lungs -responsible for keeping lungs inflated |
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Pressure gradients |
Pl - transpulmonary pressure (Pl = Pa-Ppl) Pw - transthoracic pressure Prs - transrespiratory pressure |
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What is Pta (transairway pressure) responsible for? |
Airflow in and out of the lungs |
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Info flip card |
The greater the pressure gradient needed to drive gas through the airways, the greater the airway resistance |
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Pa is always greater than Ppl (to keep from collapsing and Pl keeps the alveoli open |
Info |
