Question

Read the given statements and choose correct answer :-
(i) Initial bronchioles are supported by incomplete cartilagenous rings.
(ii) In human lungs are solid and spongy.
(iii) Alveoli wall contains simple squamous epithelium and white fibrous connective tissue (iv) Lungs are covered by a single layered pleura

• A. Three statements are correct
• B. Three statements are incorrect
• C. Only two statements are correct
• D. None of them

Answer 1

The correct option is A Three statements are correct

The lungs are the primary organs of the respiratory system in humans and

they are covered by a double layered pleura. They are a part of the lower respiratory tract that begins at the trachea and branches into the bronchi and bronchioles. In the main bronchi, hyaline cartilage forms an incomplete ring, giving a "D"-shaped appearance. The respiratory or gas-exchange surface consists of millions of small sacs, or alveoli, lined by a simple squamous epithelium and white fibrous connective tissue. The lungs feel spongy because of the presence of millions of alveoli inside them. So, i, ii and iii statements are correct.

So, the correct option is 'Three statements are correct'.