[RS] Q.1) Division of respiratory tract:

Ans.
 
a) Upper respiratory tract which included-

•  Nose 
•  Nasopharynx 
•  Oropharynx
•  Larynx up to vocal fold.

b) Lower respiratory tract which included-

• Larynx below the vocal fold 
• Trachea 
• Two bronchi
• Bronchioles 
• Terminal bronchioles
• Respiratory bronchioles 
• Alveolar duct 
• Atria 
• Air sac 
• Alveoli