Across
- 4. Main organs of the respiratory system that allow the inhalation of oxygen and the exhalation of carbon dioxide.
- 7. allow air to get from the trachea to the alveoli.
- 8. is a strong muscle beneath the lungs. It contracts when breathing.
- 9. tube-like structure which connects the nose and mouth to the lungs.
- 10. the process of taking in oxygen and releasing carbon dioxide from the body.
Down
- 1. gas that enters the blood through the lungs and travels to the heart to be pumped via arteries to all body cells.
- 2. A gas that is expelled from the body by the respiratory system.
- 3. sacs that hold air and allow the air to contact capillaries of the circulatory system.
- 5. connect the lungs to the trachea.
- 6. the system of the body that brings oxygen into the body and releases carbon dioxide.