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StudyStack Set 2

StudyStack Set 2 - Respiratory, Chapter 36

TermDefinition
Pulmonary Ventilation The movement of air into and out of the lungs during breathing.
Intrapleural Pressure (PIP) The pressure within the pleural cavity; it is always lower than alveolar and atmospheric pressure.
What is the intrapleural pressure at the beginning of inspiration? About 758 mmHg (approximately −2 mmHg relative to atmospheric pressure).
Alveolar Pressure The pressure of air within the alveoli that determines the direction of airflow.
Why does air move into the lungs during inspiration? Because alveolar pressure becomes lower than atmospheric pressure, creating a pressure gradient.
Compliance The ability of the lungs and thorax to stretch and expand during inspiration.
What happens if lung compliance is reduced? Inspiration becomes difficult or may require more energy due to stiff lungs.
Quiet Inspiration An active process where the thorax enlarges, intrapleural pressure decreases, and air flows into the lungs.
Quiet Expiration A passive process that occurs when inspiratory muscles relax and air flows out of the lungs.
Why is intrapleural pressure always negative? To prevent lung collapse caused by elastic recoil and surface tension in the alveoli.
Transpulmonary Pressure The difference between intrapleural pressure and alveolar pressure (PIP − PA).
Created by: user-2011095
 

 



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