The lungs are increasing in volume due to the contraction of the primary inspiratory muscles which are the and .

lateral external intercostals and external intercostal muscles

Explanation:

The inspiration is the process of drawing air into the lungs. The primary muscles required for the inspiration include internal and intercostal muscles, parasternal portion required for the internal intercostal muscles.

These muscles can elevate the bony ribs when the air for breathing is inhaled and increase the air capacity for lungs.

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