What is the role of the intercostal muscles and diaphragm in the normal process of inspiration and expiration

Jennifer smith is admitted to the hospital after a direct blow to her chest during a football game causes damage to her intercostal muscles. She has trouble breathing. The respiratory physician notes there is a greater decrease in her alveolar ventilation than in minute ventilation.

What is the role of the intercostal muscles and diaphragm in the normal process of inspiration and expiration? Include in your explanation an explanation of Boyle’s law and why it is important in these processes.

What is the difference between alveolar ventilation rate and minute ventilation? Which is the better indicator of gas exchange and why?