Respiratory System labeling Online version respiratory system by Dr. David Myers 1 nose 2 nasal cavity 3 paranasal sinuses 4 nasopharynx 5 adenoids 6 oropharynx 7 tonsils 8 laryngopharynx 9 larynx 10 esophagus 11 epiglottis 12 trachea 13 mediastinum 14 bronchi 15 lung 16 bronchiole 17 alveoli 18 capillary 19 red blood cells 20 parietal pleura 21 visceral pleura 22 diaphragm