$CO$ (Carbon monoxide) is harmful because:

In which disease does fluid accumulate in the alveoli and bronchioles?

Differentiate between: Emphysema and occupational respiratory disorders.

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:

Give differences between Asthma and Emphysema.

Which of the following is a disease that affects the respiratory system?