Pathway of Oxygen 1.Air into nose or mouth 3. Air goes to the Trachea 4. Bronchi 5. Lungs6. Bronchioles 7. Alveoli 8. Capillaries (picks up O 2 and drops off CO 2 ) 9. Bloodstream 2. The air moves through the pharynx and larynx and the epiglottis opens.
Nose Mouth Pharynx Larynx Trachea Lungs Bronchi Bronchioles DiaphragmAlveoli
Pathway of Carbon Dioxide 9. Air out of nose or mouth 7. Trachea 6. Bronchi 5. Lungs4. Bronchioles 3. Alveoli 2. Capillaries (drops off CO 2 and picks up O 2 ) 1. Bloodstream 8. Epiglottis opens then CO 2 moves through larynx and pharynx
Lungs Main organs of the respiratory system Bronchial tubes Many smaller tubes Alveoli (alveolus) – surrounded by capillaries Average adult's lungs contain about 600 million of these air-filled sacs
The Diaphragm The muscle that controls the breathing process. The diaphragm flattens to cause the chest to expand and air is pulled into the lungs. When the diaphragm relaxes, the chest collapses and the air in the lungs is forced out.