Quiz 3: Cardiopulmonary Symptoms
A 1. Inspiratory phase: Reflex opening of the glottis and contraction of the diaphragm and the thoracic and abdominal muscles cause a deep inspiration with a concomitant increase in lung volume accompanied by an increase in the caliber and length of the bronchi. 2. Compression phase: Closure of the glottis and relaxation of the diaphragm while the expiratory muscles contract against the closed glottis can generate very high intrathoracic pressures and narrowing of the trachea and bronchi. 3. Expiratory phase: Opening of the glottis and explosive release of trapped intrathoracic air occur, along with vibration of the vocal cords and of the mucosal lining of the posterior laryngeal wall, which shakes secretions loose from the larynx and moves undesired material out of the respiratory tract.