Action during inhalation | Action during exhalation | |
external intercostal muscles | Contract | |
Internal intercostal muscles | ||
ribs | move down and in | |
diaphragm | ||
volume of thorax | ||
pressure in thorax | ||
volume of air in lungs |
Action during inhalation | Action during exhalation | |
external intercostal muscles | Contract Relax | |
Internal intercostal muscles | Relax Contract | |
ribs | Expand (move up and out) | move down and in |
diaphragm | Contract Relax | |
volume of thorax | Increases Decreases | |
pressure in thorax | Decreases Increases | |
volume of air in lungs Increases
|