Lungs comprises |
|||||||
a) |
Network of bronchi |
b) |
Bronchioles |
c) |
Alveoli |
d) |
All of these |
Lungs comprises |
|||||||
a) |
Network of bronchi |
b) |
Bronchioles |
c) |
Alveoli |
d) |
All of these |
(d)
Inside the lungs, each bronchus divides into numerous bronchioles, each of which terminates into an elongated saccule called the alveolar duct, which bears air sacks or alveoli on its surface. Alveoli provides a large surface for gaseous exchange. The number of alveoli in the human lungs has been estimated to be approximately 750 million