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firstly the intraplural cavity is a closed space and pressure change is due to increased volume. For example with the contraction of the diaphram causing the intraplural cavity to increase in size and therefore reducing the pressure causing inspiration. Since the intraplural space is attached to the lungs, the lungs also expands, theoretically increasing space and therefore reducing volume. So if the intraplural pressure down, lung pressure will also go down and vise versa with exhilation. hope that helps.

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