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Respiratory system , NOTE: the respiratory zone is consist of the…

- - - - Lower (secondary) bronchus
      - Segmental (tertiary) bronchus
      - Main (primary) bronchus
    - - Terminal bronchioles
      - Respiratory bronchioles
      - Conducting bronchioles
    - - Alveolar sac
      - Alveolus
      - Alveolar duct
- - - - Originate near the bronchi and empty into:
        
        Left: the accessory hemiazygos vein or superior intercostal vein
        
        Right: The azygos vein
      - Drain deoxygenated blood from hilar structures and conducting zone strucutres
    - - Right: usually 1 artery that arises from:
        
        Thoracic aorta
        
        Left superior bronchial artery
        
        Right posterior intercostal artery
      - Left: Usually 2 arise from thoracic aorta
      - Supply oxygenated blood to the lung parenchyma, bronchi and the visceral plura
- - - - β2-agonist (albuterol, salmeterol, formoterol) bronchodilators
      - Muscarinic antagonists (tiotropium, ipratropium) bronchodilators
- - - - Located at the Hilum of the lungs
      - Tracheobronchial nodes
        
        Bronchomediastinal nodes
        
        Located on the right and left sides of the trachea
        
        Drain into either:
        
        Left: Thoracic duct
        
        Right: Right lymphatic duct
        
        Located at the bifurcation of the trachea