In which of the following disorders do the alveoli get filled with fluid, leading to severe problems in respiration?

Asthma may be attributed to

'Asthma' is caused by

The oxygen toxicity is related with

Describe the disorders or deficiencies occurring due to disorders of the respiratory system.

$A$: Emphysema is a chronic obstructive pulmonary disease,causing irreversible distension and loss of elasticity of the alveoli.
$R$: Emphysema is preventable if chronic exposure to smoke (cigarette and others) and pollutants is avoided.