BI-1082
The breathing system
Biology · Secondary 3 · Medium · The breathing system
Which change in the diaphragm and external intercostal muscles occurs during inspiration (breathing in)?
- Diaphragm contracts; external intercostal muscles contract.
- Diaphragm relaxes; external intercostal muscles contract.
- Diaphragm contracts; external intercostal muscles relax.
- Diaphragm relaxes; external intercostal muscles relax.
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