During expiration the diaphragm becomes
- AFlattened
- BDome - shaped
- CNormal
- DOblique
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (b) Dome - shaped
Explanation
In expiration (breathing out), the diaphragm relaxes and returns to its dome shape, pushing up into the chest. The ribs move down and in, the chest cavity becomes smaller, and air is forced out of the lungs.
In inspiration the diaphragm contracts and becomes flat.