In order to inspire to a lung volume greater than approximately 70% of TLC, the inspiratory muscles must overcome:

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At the beginning of the breath, the tendency of the chest wall to expand facilitates lung expansion. When lung volume nears 70% of the VC, the chest wall reaches its natural resting level. In order to inspire to a lung volume greater than approximately 70% of TLC, the inspiratory muscles must overcome the recoil of both the lungs and the chest wall (see Figure 11-7).

In Order to Inspire to a Lung Volume Greater Than