What is the color of the organs in the body during cyanosis?

Asthma may be attributed to

In heavy smokers,the alveoli of the lungs are enlarged and damaged,which reduces the surface area for the exchange of respiratory gases. This condition is called:

Which of the following is an occupational respiratory disease?

Select the correct option:
$(1)$ Nasal cavity acts as an air conditioner.
$(2)$ Cigarette smoke causes emphysema.

Which of the following is associated with an occupational hazard?