Question

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

Answer 1

The answer is (d) Nostrils → pharynx → larynx → trachea → alveoli

• 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.