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.
The main cause of emphysema is smoking. The tiny air sacs or alveoli at the bottom of the lungs, which cover a huge lung area, are surrounded by tiny blood vessels. Here, as the oxygen reaches the alveoli, it is absorbed by the blood vessels and then transferred into the bloodstream and to the rest of the body.