signs and symptoms seen in asthma
signs and symptoms seen in asthma
Breathing or pulmonary ventilation consists of two phases: inspiration during which atmospheric air is drawn and expiration by which the alveolar air is released out. the movement of air into and out of the lungs is carried out by creating a pressure gradient between the lungs and the atmosphere. There are several disorders of the respiratory tract which can cause obstruction of natural air flow. The narrowing of the diameter of the airways by contraction of respiratory muscles can obstruct airflow to the lungs primarily and can increase airflow resistance. Asthma is a kind of such respiratory disorder which causes severe breathing problems due to construction in the pulmonary tubes, due to mucus deposition and narrowing of the airways.
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