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Air is breathed through

1. Trachea — lungs — larynx — pharynx — alveoli
2. Nose — larynx — pharynx — bronchus — alveoli — bronchioles
3. Nostrils — pharynx — larynx — trachea — bronchi — bronchioles — alveoli
4. Nose — mouth — lungs

Correct answer: Nostrils — pharynx — larynx — trachea — bronchi — bronchioles — alveoli

Solution

Air follows a fixed anatomical route from the nostrils through the upper airway, then down the trachea into progressively smaller bronchi and bronchioles before reaching the alveoli. The correct option lists this sequence in order.

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