1. THE RESPIRATORY SYSTEM

2. RESPIRATORY SYSTEM Respiratory System exchanges gases between the body and the environment.

3. RESPIRATORY SYSTEM Air passes through the nose and mouth, pharynx, trachea, bronchi, and lungs. The parts of the respiratory system work together and supply the body with oxygen.

4. PHARYNX AND TRACHEA Inhale – when oxygen enters the body (breathe in) Exhale – Carbon dioxide leaves the body

5. PHARYNX When we inhale, air enters the nostrils and passes through the pharynx. The pharynx is part of both the digestive and respiratory systems.

6. PHARNYX Digestive Food passes through the pharynx to the esophagus Respiratory Air travels through the pharynx to the trachea

7. TRACHEA Trachea is also called the windpipe because it is long, tube-like organ that connects the pharynx to the bronchi.

8. BRONCHI There are two bronchi (one left and one right) Bronchi divide into smaller tubes that end in tiny groups of cells called alveoli

9. ALVEOLI Inside each lung, there are more than 100 million alveoli. The alveoli are surrounded by blood vessels called capillaries. Transition between the respiratory system and circulatory system occurs when oxygen transfers from alveoli to capillaries.