Stages of airways narrowing during asthma attack with possible formation of mucus plug. Smooth muscle layer goes into spasm, middle layer swells, excessive mucus is produced. premium vector by [email protected]

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health asthmatic asthma respiratory illness disease science cells mucus airway obstruction lungs bronchial swelling inflammation respiration anatomical bronchi mucous spasm pulmonary bronchial asthma smooth muscle inner layer smooth muscle tissue mucus plug middle layer

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