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the thoracic chamber is anatomically an air tight chamber justify
 

Thoracic chamber is made up of *Diaphragm on lower side *Sternum on ventral side *Ribs on lateral side *Vertebral column on dorsal side So it is 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 . It iis essential for breathing.
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