The trachea is made up of mainly ……..
a) bones
b) muscles
c) cartilage
d) collagen fibre
The trachea has……C shaped cartilaginous rings
a) 15-25
b) 30-40
c) 16-20
d) 10-15
The trachea has 16-20 C shaped cartilaginous rings which prevent it from ……..and keep the passage of air open.
a) diffusion
b) collapsing
c) joining
d) absorption
Inside the thorax, the trachea divides into….. branches called bronchi
a) two
b) three
c) five
d) eight
The bronchi are made up of mainly ……..
a) bones
b) muscles
c) cartilage
d) collagen fibre
When bronchi attain the diameter of ……..then they are called bronchioles
a) 3mm or less
b)2 mm or less
c) 1 mm or less
d) 0.5 mm
