When we first meet Dory, she's just swimming around minding her own business when suddenly she bumps into Marlin and instantly offers to help him hunt down his son.
Chronic obstructive pulmonary disease (COPD) is a leading cause of death and disability internationally. Alveolar hypoxia and consequent hypoxemia increase in prevalence as disease severity increases.
Causes of Emphysema. The most common emphysema causes are from breathing in fumes and other irritants that damage the lungs and airways. Cigarette smoking is the most common irritant that causes the disease, but other factors (including dust and genetics) can cause it as well.