| A | B |
|---|
| nasal cavity - hairs | filter the air |
| nasal cavity - capillaries | warm up the air |
| nasal cavity - mucus | moiten the air |
| pharynx | crossover point for the digestive and respiratory tracts |
| trachea and bronchi - mucus | captures the foreigh particles |
| trachea and bronchi - cilia | expelled the foreigh particles |
| diaphragm | muscle that supports the lungs |
| alveoli | oxygenate and purify the blood |
