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Le syst me respiratoire

Retenez votre respiration le plus longtemps que vous le pouvez . On peut survivre plusieurs semaines sans manger et quelques jours sans boire, mais il faut absolument respirer en tout temps pour vivre. La respiration est essentielle aux cellules de l'organisme. Sans l'oxygne les cellules

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Le syst me respiratoire

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