1) Foreign particles (generally caused by smoking or long-term exposure to air pollution) get trapped in alveoli
2) Inflammation is caused, attracting phagocyte which break down elastin; a protein found in the alveoli walls
3) Alveoli unable to recoil to expel air, so it remains in the alveoli
4) Alveoli walls detroyed, reducing surface area, thus gaseous exchange.
5)Symptoms: shortness of breath, blueish skin tinge, coughing/wheezing and increased breathing rate
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