PHGY 210 Lecture Notes - Lecture 6: Smooth Muscle Tissue, Transpulmonary Pressure, Pressure Sensor

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Pleural space is the space between rib cage and the lungs, it is filled with small amount of fluid. When breath in, bring down the respiratory muscle to contract. Chest size will enlarge, and the diaphragm will go down, the intercostal contract. The lung will be pull open due to the coupling between chest and lungs by pleural space. separated (cid:894)do(cid:374)"t (cid:272)o(cid:374)(cid:374)e(cid:272)t to ea(cid:272)h other) the pleural space(which is already. Right and left pleural space are negative ) Pleural space is negative, due to the lung always want to collapse but the rib cage tend to expand. At rest, the pressure in the pleural space, the pleural pressure (ppl), is negative. This is due to the opposing forces acting on the lung and chest wall. Indeed, if a hole is punctured through the chest wall (pneumothorax), the lungs collapse and the chest springs outwards.

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