BIOL112A 6A: Flat Respiratory System Model

1* humidify, warm, filter, and protect

Nasal cavity

2* passageway to the lungs and connect Eustachian tube, lymphatic drainage

Nasopharynx

3* passageway for food from mouth to esophagus, coughing, and vomiting

Oropharynx

4* directs air downward into the lungs

Laryngopharynx

6* transport air in and out during breathing

Trachea

7

Left primary bronchus

8

Right primary bronchus

9

Secondary bronchus

10

Superior lobe of left lung

11

Inferior lobe of left lung

12* ensure that air is distributed to all parts of the lungs and can be used by alveoli for gas exchange

Terminal bronchiole

13* carry air to alveoli to perform gas exchange

Respiratory bronchiole

14* collect and direct the oxygen entering the alveoli and the carbon dioxide exiting the lungs

Alveolar duct

15* a cluster of alveoli at the end of an alveolar duct, majority of gas exchange

Alveolar sac

16* used for exchange of oxygen and carbon dioxide

Pulmonary alveoli

19* regulates bronchial smooth muscle tone, vascular permeability, and blood flow

Pulmonary capillary plexus