Respiratory disorders are common in both developed and developing countries. Many of these disorders are directly connected to the constrictions in the airways of the human respiratory system. Asthma and bronchitis are typical examples that arise from the constriction of airways.
Asthma is a respiratory disease that is characterised by chronic inflammation, hypersensitivity, and obstruction of the airways. During an asthma attack contraction of airway smooth muscle and mucous production cause a reduction of the bronchial diameter, significantly changing the airflow resistance in and out of the lungs.