How is alveolar pressure and composition effected by a punctured thoracic cavity?

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it simply means your lungs are going to be compressed by the enlargement of pleura. the pleura is the lining just before your lungs. if this gets filled with air(pneumothorax) or water (hydrothorax) or blood (hemothorax) then it would inflate like a balloon and exert pressure on the surrounding areas like your LUNGS.
results?
difficulty in breathing.
if unattended, death.
this is the common case for those people who suffer from hack wounds or stabs/punctures in the thoracic area. they get well after treatment but after some time, they experience laboured breathing resulting from the blood and water balooning the pleura.

JOMAR S.T. NDGM '96

Other Answers:
An untreated thoracic punture essentially is a pneumo or partial pneumothorax resulting in air and or fluid in the pleural cavity resulting in the lung or lobe of the lung collasping. and no air movement in the affected area. This includes the alveoli in the lung/area of the lung affected. The alveoli need gas exchange to stay opened.so there is no gas exchange in the affected area. A small pneumo may resolve itself, a large pneumo may need a chest tube inserted to drain the air/fluid and to create the negative pressure allowing the area affected to reopen.

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How is alveolar pressure and composition effected by a punctured thoracic cavity?

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