BI-1089
The breathing system
Biology · Secondary 3 · Medium · The breathing system
Which change in the breathing muscles occurs during inspiration (breathing in) at rest?
- Diaphragm and external intercostal muscles contract.
- Diaphragm and external intercostal muscles relax.
- Diaphragm contracts and external intercostal muscles relax.
- Diaphragm relaxes and external intercostal muscles contract.
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