The respiratory system

1. Expiration

1.1. Alveoli

1.2. Bronchioles

1.3. Bronchi

1.4. Trachea/Windpipe

1.5. Larynx

1.6. Pharynx

1.7. Nostrils

2. Inspiration

2.1. Nostrils

2.2. Pharynx

2.3. Larynx

2.4. Trachea/Windpipe

2.5. Bronchi

2.6. Bronchioles

2.7. Alveoli

3. Gas exchange: - Oxygen passes from the alveoli to the blood. - Carbon dioxide passes from the blood to the alveoli.

4. Oxygen

5. Carbon dioxide