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- de la trachée qui fait suite au larynx et débute juste après les cordes vocales. C’est un tube dont le rôle est de permettre le passage de l’air vers les bronches ;- des bronches qui se divisent en bronchioles, de plus en plus finement ;- des alvéoles pulmonaires tapissées par une très fine membrane qui les sépare d’un réseau de capillaires sanguins. C’est à ce niveau que vont se faire les échanges gazeux entre l’air alvéolaire et le sang.- Le sang se charge en O2 au cours de l’inspiration et le transporte vers les cellules qui l’utilisent comme source d’énergie. Le CO2 est ramené par voie sanguine vers les poumons et éliminé lors de l’expiration.

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