What happens to the diaphragm muscles during the process of inspiration?

Air moves into the lungs when

$A$: Normal expiration during quiet breathing,unlike inspiration,is a passive process because no muscular contractions are involved.
$R$: Normal expiration results from the elastic recoil of the chest wall and lungs.

Define the following terms:
$(1)$ Inspiration
$(2)$ Expiration

If there is a puncture in the thoracic cavity but not in the lungs,then...

In an accident,a man dies immediately although there was no injury to the brain,kidney,stomach,or heart. The probable cause of death may be: