Why does Expiration take longer than inspiration?

Expiration even though is physiologically longer than inspiration, on auscultation over lung fields it will be shorter. The air moves away from alveoli towards central airway during expiration, hence you can hear only early third of expiration. The normal forced expiration time is less than 5 seconds.Click to see full answer. Beside this, how does inspiration differ from expiration?During inspiration, the diaphragm contracts and pulls downward while the muscles between the ribs contract and pull upward. During expiration, the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases. As a result, the lungs contract and air is forced out.Beside above, what muscles are used during inspiration and expiration? Inspiration allows air to be moved into the lungs and requires the contraction of various muscles: The diaphragm and external intercostal muscles contract. When the diaphragm contracts, it flattens, pressing down on the abdominal contents and lifting the thoracic cavity. can the breath be held for a longer or shorter time after hyperventilation? After hyperventilation, is the breath held for a longer or shorter period of time compared to holding the breathe after normal breathing? Athletic performance. Hyperventilation decreases PaCO2 and increases both PAO2 and PaO2.What causes prolonged expiration? 197 Possible Causes for Prolonged Expiration Asthma. expiration, elevated jugular venous pulse, and cyanosis.[medicinenet.com] […] Chronic Obstructive Pulmonary Disease. Allergic Asthma. Hyperactive Airway Disease. Bronchiolitis. Aspiration Pneumonia. Pulmonary Nematodiasis. Laryngeal Lesion.