8 1. Pulmonary ventilation ● Definition o Principles of pulmonary ventilation 米 Driving force Direct pressure changes in alveoli Source contraction of respiratory muscles Inspiratory muscles Diaphragm, External intercostal muscle Expiratory muscles: Diaphragm, Ext-& Internal intercostals Accessory respiratory muscles§ 1. Pulmonary ventilation • Definition • Principles of pulmonary ventilation * Driving force Direct ~: pressure changes in alveoli Source ~: contraction of respiratory muscles Inspiratory muscles: Diaphragm, External intercostal muscle Expiratory muscles: Diaphragm, Ext- & Internal intercostals Accessory respiratory muscles