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Intrapulmonary pressure is the pressure within the air passage and the alveoli of the lungs.
Inspiration occurs when the intrapulmonary pressure decreases to below atmospheric pressure
When the atmospheric pressure is higher than intrapulmonary pressure pressure, inspiration will not take place.
Pressure increases as volume increases, granted the container stays the same.
Intrapulmonary pressure will equalize to atmospheric pressure during a breathing cycle, but intrapleural pressure should always be less than atmospheric pressure.
Intrapulmonary pressure
expiration
The intrapulmonary pressure is the pressure in the alveoli. Intrapulmonary pressure rises and falls with the phases of breathing, but it ALWAYS eventually equalizes with the atmospheric pressure.
Transpulmonary pressure
Intrapulmonary Pressure
Decrease
Intrapulmonary pressure