6 Glottis

12 Terminal Bronchiole

3 Nasopharynx

5 Laryngopharynx

9 Secondary Bronchus

8 Primary Bronchus

4 Oropharynx

11 Bronchiole

7 Trachea

13 Respiratory Bronchiole

1 External Nares (nostrils)

2 Nasal Cavity

15 Eyrthrocytes (RBCs)

14 Alveolus

10 Teriary Bronchus