Why is there prolonged expiration in asthma?

Prolonged expiration in Asthma occurs due to bronchoconstriction, which narrows the airways and increases resistance to airflow. During an asthma attack, inflammation and mucus production further obstruct the air passages, making it difficult for air to exit the lungs. This results in a prolonged expiration phase as the body struggles to expel air, leading to symptoms like wheezing and shortness of breath.