Question 15 - MCQs from NCERT Exemplar - Chapter 6 Class 10 - Life Processes

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

The passage of air through the human respiratory system starts from the nostrils.  

• The air then moves through the pharynx and larynx to reach the trachea .
• The trachea divides into 2 smaller branches, inside the lungs , called the bronchi which further divide into smaller branches called bronchioles . 
• Each bronchi at its end has several balloon like structures called alveoli that facilitate in the exchange of gases between the blood and air in the lungs. 

(d) Nostrils → pharynx → larynx → trachea → alveoli