Match the following: (i) Nostrils (ii) Nasal passages (iii) Windpipe (iv) Alveoli (v) Ribcage — (a) fresh air from outside enters (b) exchange of gases occurs (c) protects lungs (d) tiny hair and mucus help to trap dust and dirt from the air we breathe (e) air reaches our lungs through this part
(i) Nostrils - (a) fresh air from outside enters; (ii) Nasal passages - (d) tiny hair and mucus help to trap dust and dirt from the air we breathe; (iii) Windpipe - (e) air reaches our lungs through this part; (iv) Alveoli - (b) exchange of gases occurs; (v) Ribcage - (c) protects lungs
Explanation
The chapter describes the respiratory system in detail. Nostrils are the pair of nasal openings through which we inhale and exhale air. Nasal passages contain tiny hair and mucus that trap dust and dirt. The windpipe forms branches that enter the lungs. Alveoli are balloon-like sacs where the exchange of oxygen and carbon dioxide occurs. The rib cage protects the lungs.