BI-1040
The breathing system
Biology · Secondary 3 · Medium · The breathing system
During exhalation in normal, quiet breathing, what happens to the diaphragm and the volume of the thoracic cavity?
- The diaphragm relaxes and the thoracic cavity volume decreases.
- The diaphragm relaxes and the thoracic cavity volume increases.
- The diaphragm contracts and the thoracic cavity volume decreases.
- The diaphragm contracts and the thoracic cavity volume stays the same.
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