Which is the correct sequence of air passage during inhalation?
(a) Nostrils larynx
pharynx
trachea
lungs
(b) Nasal passage trachea
pharynx
larynx
alveoli
(c) larynx nostrils
pharynx
lungs
(d) Nostrils pharynx
larynx
trachea
alveoli
Ans.(d)
Air is drawn into our body through the nostrils, then it goes into nasal passage from there it enters pharynx then to larynx to trachea to finally alveoli where the final oxygen and carbon dioxide are exchanged.
So the correct passage is: Nostrils ⇒ pharynx ⇒ larynx ⇒ trachea ⇒ alveoli
Hence option (d) is correct.