Topic: BREATHING AND EXCHANGES OF GASES

Q:

Mammalian lungs have enormous number of minute alveoli (air sacs). It to allow

(a) :  More space for increasing the volume of inspired air
(b) :   More surface area for diffusion of gases
(c) :  More spongy texture for keeping lungs in proper shape
(d) :   More nerve supply to keep organs active when working
Answer:   More surface area for diffusion of gases
Explanation:  

In mammalian lungs each alveolar duct ends in a passage, called atrium , which leads into a number of rounded alveolar sacs . Each alveolar sac is studded with a large number of air sacs or alveoli. Alveoli are the sites of respiration.


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