Which of the following is an incorrect statement w.r.t alveoli of lungs ?

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They are thin vascularized, irregular - walled bag-like structures.

They provide high surface area for gaseous exchange.

They are lined with simple columnar epithelium.

There are 300-350 million alveoli in each lung.

answer is C.

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Detailed Solution

Alveoli are lined by simple squamous epithelium.

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