Q: Which axis experiences an increase in thoracic volume due to contraction of the diaphragm during inspiration?  

Answer: B

During inspiration, the diaphragm contracts and moves downwards, causing an increase in the thoracic volume in the antero-posterior axis. This leads to an increase in the space available for the lungs to expand, allowing for the intake of air. The movement of the sternum during inspiration also causes an increase in the thoracic volume, but this occurs in the antero-ventral direction. The dorso-ventral and dorso-posterior axes do not experience significant changes in volume during inspiration.

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