1) air enters through nose and mouth
2) nasal passages moisten, filter and warm the air
3) air passes through larynx (voice box) on its way to the trachea (windpipe)
4) trachea divides into 2 bronchi and each bronchus branches out into smaller tubes called bronchioles
5) the bronchioles are split up into alveoli (thin-walled spongy air sacs). The alveoli fill with air when we breathe, and then empty as we breathe out.
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