Breathing in moves your ribcage away, so your external intercostal muscles contract. Breathing out moves your ribcage in, so your internal intercostal muscles contract.
La respiración entra aleja la caja torácica, por lo que los músculos intercostales externos se contraen; la respiración sale acerca la caja torácica, por lo que los músculos intercostales internos se contraen.
| Front | Breathing in moves your ribcage away, so your external intercostal muscles contract. |
|---|---|
| Back | Breathing out moves your ribcage in, so your internal intercostal muscles contract. |
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