The state during which the respiratory centre is inhibited is termed as:

Chronic respiratory disorders like $.......$ are caused by pollen grains.

When the blood contains a high percentage of $CO_2$ and a very low percentage of $O_2$,the breathing stops and the person becomes unconscious. This condition is known as:

Due to increasing air-borne allergens and pollutants,many people in urban areas are suffering from respiratory disorders causing wheezing due to:

"Long exposure of certain substances can give rise to inflammation leading to fibrosis". This condition is present in $ - $

Name the chronic respiratory disorder caused mainly by cigarette smoking in which alveolar walls are damaged.