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 Nostrils  pharynx  larynx  trachea  alveoli

Answer is (d) Nostrils ® pharynx ® larynx ® trachea ® alveoli

Explanation:

Air enter respiratory system through nostrils through nostrils, passes to pharynx,larynx, trachea and then to alveoli. After inhalation diaphragm and intercoastal muscles contract along with expansion of thoracic muscles which creates enough space for the air to enter into the lungs.