Lungs have a large number of narrow tubes called

Which are the main parts of the pharynx?

Which structure in humans is analogous to the spiracle of a cockroach?

Which structure in humans is analogous to the spiracles of a cockroach?

Oxygen in the lungs ultimately reaches in

Select the correct statements about alveoli from the following.
$i$. Air sac of each terminal bronchiole shows $10$ to $12$ alveoli.
$ii$. Each alveolus is surrounded by a network of capillaries.
$iii$. They are lined by ciliated pseudostratified epithelium.
$iv$. They provide surface area for exchange of gases.
$v$. There are about $700$ million alveoli in the lungs.