What is the function of the conducting part of the human respiratory system?

What are the membranes covering the lungs called?

What is called the bronchial tree?

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.

The alveolar sac of the lungs and the villi of the intestine have a similar function,which is that:

The covering of the lungs in humans is known as....