Which of the following factors affecting the diaphragm MOST likely will cause an automatic firing of the accessory muscles to trigger inspiration?

Question

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Patients with COPD tend to develop a flattening of the diaphragm due to the presence of hyperinflated lungs.A flat and rigid diaphragm cannot be strengthened and will cause an automatic firing of the accessory muscles to trigger inspiration.The other factors may affect normal excursion of the diaphragm,but still allow for the diaphragm to function.

Which of the Following Factors Affecting the Diaphragm MOST Likely