ASTHMA ATTACK......

Attack usually starts as an allergic reaction to pollen,smog or another substance mistaken for a threat by body's defense system..

HOW THE LUNG WORK....

- Fresh oxygen inhaled

- Travel through bronchial tree

- Oxygen enters blood through the alveoli walls

- carbon dioxide passes from blood into alveoli and exhale from boy

ASTHMA ATTACK

what can keep air from entering, leaving the lungs

1) Muscus surrounding airway tighten to constrict them

2) Inflammation of lining shrinks passageway

3) Excess mucus blocked airway