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The primary function of the respiratory system is to exchange oxygen and carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli.

The primary function of the respiratory system is to exchange oxygen and carbon dioxide. Inhaled oxygen enters the lungs and reaches the alveoli.

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s 500 px 281 px 0.5
m 1000 px 563 px 2
l 2000 px 1125 px 8
xl 3840 px 2160 px 15

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