Question

what is emphysema why does this occur

Answer 1

Emphysema is a long-term, progressive disease of the lungs that primarily causes shortness of breath due to over-inflation of the alveoli (air sacs in the lung). In people withemphysema, the lung tissue involved in exchange of gases (oxygen and carbon dioxide) is impaired or destroyed.

Answer 2

hey mate here is the answer....

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Emphysema:
The the word emphysema means 'full of air' or 'inflammation'.
It is a chronic disorder.
Cause:
The major cause is excessive cigarette smoking.
Others may include inhalation of smoke or toxic substances over a period of time. Symptoms:
The walls of alveoli are damage due to excessive smoking, lose of elasticity of walls of bronchioles and alveoli.
Due to this the surface area for exchange of gases is reduced.
Alveolar sac remain filled with air even after expiration.
The lungs remain in plated as exhalation becomes difficult.
This disease may be prevented by avoiding cigarette smoking.
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thanks...

nice to help you