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Question
Which of the following structures are supported by incomplete cartilaginous rings?
a. Trachea,
b. 1∘ bronchi,
c. 2∘ bronchi,
d. 3∘ bronchi,
e. initial bronchioles,
f. terminal bronchioles,
g. duct of alveoli,
h. alveoli
a. Trachea,
b. 1∘ bronchi,
c. 2∘ bronchi,
d. 3∘ bronchi,
e. initial bronchioles,
f. terminal bronchioles,
g. duct of alveoli,
h. alveoli
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Solution
Incomplete cartilaginous rings
C-shaped rings of hyaline cartilage are present in the human respiratory system which are incomplete at the dorsal surface.
The C-shaped cartilages starts from trachea and thereby prevents the trachea from collapsing and also provide flexibility.
And continues upto the initial bronchioles.
It further gives rise to terminal bronchioles to which alveoli or air sac are attached
They are very thin, irregular walled and vascularised bag-like structures which are in close contact with blood capillaries for easy exchange of gases
Presence of cartilage will create hindrance in exchange of gases.
Final answer
(A) a, b, c, d and e
C-shaped rings of hyaline cartilage are present in the human respiratory system which are incomplete at the dorsal surface.
The C-shaped cartilages starts from trachea and thereby prevents the trachea from collapsing and also provide flexibility.
And continues upto the initial bronchioles.
It further gives rise to terminal bronchioles to which alveoli or air sac are attached
They are very thin, irregular walled and vascularised bag-like structures which are in close contact with blood capillaries for easy exchange of gases
Presence of cartilage will create hindrance in exchange of gases.
Final answer
(A) a, b, c, d and e
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