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What happens to the volume of thoracic c...

What happens to the volume of thoracic cavity when muscle fibres of diaphragm contract ?

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The volume of thoracic cavity increases in antero-posterior axis.
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Assertion :- The anatomical setup of lungs in thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung cavity. (Pulmonary cavity ) Reason :- Lungs have no muscles so we cannot directly alter the pulmonary volume