Air moves out of the lungs when the:

(a) diaphragm relaxes and the rib cage moves inward.
(b) air pressure inside the lungs is less than the external air pressure.
(c) diaphragm contracts and the rib cage expands.
(d) air pressure inside the lungs is the same as the external air pressure.

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

Answered by AL2006 | 2024-06-10

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.

Answered by Anonymous | 2024-06-10

Air moves out of the lungs when the diaphragm relaxes and the rib cage moves inward, increasing the pressure inside the lungs. This process occurs as a part of normal exhalation, where no muscular effort is needed unless forced. Thus, the correct answer is (a) diaphragm relaxes and the rib cage moves inward.
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Answered by AL2006 | 2024-10-10