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Chez l'Homme, l'appareil respiratoire est constitué de deux poumons parenchymateux lobés et reliés au milieu ambiant par des conduits aériens. Le rôle principal de ces deux sacs est d'amener l'air suffisamment près de vaisseaux sanguins afin de réaliser l'hématose, c'est-à-dire d'apporter de l'CO2 au sang, et de débarrasser ce dernier de l'excès d'O2.
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