Main Menu » Organs & Systems » Respiratory » Intrapulmonary Passageways Overview of intrapulmonary passageways Overview 1 Conducting Secondary Bronchus Secondary bronchus 1 Secondary bronchus 3 Secondary bronchus 2 Secondary bronchus 4 Secondary bronchus 6 Secondary bronchus 5 Secondary bronchus 7 Bronchiole Bronchiole 1A Bronchiole 2A Bronchiole 3A Bronchiole 4A Bronchiole 5A Bronchiole 6AA Bronchiole 7A Bronchiole 8A Respiratory Overview of respiratory intrapulmonary passageways Respiratory Bronchiole Respiratory bronchiole 1 Respiratory bronchiole 8 Respiratory bronchiole 4 Respiratory bronchiole 9 Respiratory bronchiole 10 Respiratory bronchiole 11 Alveolar Duct Alveolar duct 1A Alveolar duct 2A Alveolar duct 3A Alveolar duct 4A Alveolar duct 5A Alveolar duct 8A Alveolar duct 6A Alveolar duct 7A Alveoli Alveoli 1 Alveoli 2 Alveoli 4 Alveolus 9 Alveoli 3 Alveoli 7 Alveoli 5 Alveoli 8