BI-2246
The breathing system
Biology · Secondary 4 · Medium · The breathing system
Which statement correctly describes the role of the diaphragm muscles during breathing in humans?
- They contract, flatten the diaphragm and draw air into the lungs.
- They contract, dome the diaphragm and force air out of the lungs.
- They relax, flatten the diaphragm and draw air into the lungs.
- They relax, dome the diaphragm and draw air into the lungs.
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