To becone oxygenated, blood must travel to the lungs via the pulmanory artery, where it goes in to the capillaries surrounding the alveoli within the bronchioles in the lungs.
The alveoli are small air sacks, where gas echange (between oxygen and carbon dioxide) takes place.
They have a large surface area to increase exchange rate
THey are surrounded by capillaries, so they have a rich oxygen supply, and gases don't have to travel far to diffuse.
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