Why thoracic chamber is called as an air tight chamber?
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Thoracic cavity is gaurded dorsally by vetibral column,ventrally by the sternum,laterally by the ribs and diaphragm on the lower side. It is maintained at a typical volume as it influence any volume. It will be airtight to maintain different air volumes in lunga at different phases of respiration .
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The lungs are situated in the thoracic chamber, which is anatomically an air-tight chamber. ... The anatomical setup of lungs in the thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung (pulmonary) cavity
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