Air enters the lungs when the diaphragm contracts and flattens, and the intercostal muscles contract, raising the ribcage, which increases the thoracic volume and decreases the pressure inside the lungs.
Air enters the lungs when the diaphragm contracts and flattens, and the intercostal muscles contract, raising the ribcage, which increases the thoracic volume and decreases the pressure inside the lungs.
| Front | Describe how air is taken into the lungs. ( 3 marks) |
|---|---|
| Back | contraction of (diaphragm) muscles flattens diaphragm; contraction of intercostal muscles raises ribcage; increase in volume decreases pressure; |
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