question_answer 50)

    During respiration exchange of gases take place in (a) trachea and larynx    (b) alveoli of lungs           (c) alveoli and throat      (d) throat and larynx

Answer:

                  (b) It is in the alveoli in the lungs where gaseous exchange takes place. The walls of the alveoli are very thin and surrounded by network of very thin blood capillaries. The presence of millions of alveoli in the lungs provides a large area for the exchange of gases.