BI-1095
The breathing system
Biology · Secondary 3 · Easy · The breathing system
During inhalation, what happens to the diaphragm and the external intercostal muscles?
- Diaphragm relaxes; external intercostal muscles relax
- Diaphragm contracts; external intercostal muscles relax
- Diaphragm relaxes; external intercostal muscles contract
- Diaphragm contracts; external intercostal muscles contract
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