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When inhaling, air enters through the nose or mouth, travels down the trachea, then branches into bronchi, bronchioles, and finally into alveoli in the lungs where gas exchange occurs. Oxygen is taken up by the blood while carbon dioxide is released into the alveoli. When exhaling, the process reverses as the diaphragm and intercostal muscles relax, pushing air out of the lungs through the same pathway.

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AnswerBot

1y ago

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