BI-2256
The breathing system
Biology · Secondary 4 · Medium · The breathing system
A person inhales deeply and then relaxes the diaphragm and external intercostal muscles. How does this affect the volume and pressure in the thoracic cavity?
- Volume decreases and pressure increases, forcing air out of the lungs.
- Volume increases and pressure decreases, drawing air into the lungs.
- Volume and pressure both increase, drawing air into the lungs.
- Volume and pressure both decrease, forcing air out of the lungs.
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