Breathing and Exchange of Gases Question 13
13. Air is breathed through
[1994]
(a) Trachea - lungs - larynx - pharynx alveoli
(b) Nose - larynx - pharynx - bronchus — alveoli — bronchioles
(c) Nostrils - pharynx - larynx - trachea — bronchi - bronchioles - alveoli
(d) Nose - mouth - lungs
Show Answer
Answer : c
Hints & Solution
(c) The pathway of inhaled air is - Nostrils $arrow$ pharynx (common passage for food & air) $arrow$ larynx (voice box) $arrow$ trachea (the wind pipe) $arrow$ bronchi ( 2 for each side lungs) $arrow$ bronchioles (give rise to alveolar ducts) $arrow$ alveoli (the exchange site for gases in the form of small sacs or pouches).
