Answered

Air moves out of the lungs when the

Adiaphragm relaxes and the rib cage moves inward.
Bair pressure inside the lungs is less than the external air pressure.
Cdiaphragm contracts and the rib cage expands.
Dair pressure inside the lungs is the same as the external air pressure.

Verified Answer :

AL2006

When the diaphragm relaxes, air is forced out of the lungs.

The diaphragm relaxes, and the dome moves upwards.
As for the ribs, they move upwards and outwards in inspiration, again to increase the volume of the chest cavity, and downwards and inwards in expiration.

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