Cause: Allergic Reaction - common allergens are pollen, fur + dust mites
Can be made worse by air pollution, cold weather, exercise, infection + stress
Effects: These all reduce the concentration gradient
- Lining of the airways become inflamed - reduce volume of air entering lungs
- Cells produce larger amounts of mucus
- Fluid leaves capillaries and enters airways
- Muscles lining bronchioles contract constricitng airway
Symptoms: Short of breath, wheezing sound when breathing, tight chest, coughing
Asthma cases are increasing - more pullution, cleaner lifestyles, chemicals?
Can be passed on through genes
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