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You have not given enough information to answer this question. pressure depends on volume temperature and the amount of gas. just stating that the amount of gas remains constant is not enough information.
The act of breathing air into the lungs is simply called breathing. From the lungs, the air is transferred into the blood stream and moved to the other parts of the body.
Our lungs do not collapse when we expel air forcefully because our lungs do not ever full fill or empty of air compeletly. A small amount of air remains in the lungs no matter how hard you expel your air.
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A spirometer measures the amount of air in lungs
Cor pulmonale
this is called residual volume.
The residual volume is the volume of air remaining in the lungs after the most powerful expiration.
Simply put, the gas exchange occurs in the lungs. More specifically, the blood exchange occurs at the avoli, the "air sacs" in the lungs where the surrounding capillaries can be oxygenated.
LUNGS
lungs