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Describe pulmonary pathology, including pneumothor

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Asthma is caused by the allergen-reagin reaction that occurs in the bronchioles of the lungs. Allergen stimulates histamine production from mast cells which in turn causes spasm of the bronchiolar smooth muscle. The overall result is the difficulty in breathing until histamines and allergens are removed.
Pneumothorax refers to abnormal entry of air into plueral cavity causing the collapsing of lungs and separation between visceral and parietal pleurae. This abnormal separation destroys the negative pressure of the pleural space leading to recoiling of lungs towards the hillum.

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Describe pulmonary pathology, including pneumothorax and asthma.
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