Respiratory System
Across
- 2. filters dust and particles through the nose
- 4. pumps carbon-dioxide out and pulls oxygen in
- 6. trachea is also called the
- 7. oxygen enters the mouth and nose through the
- 9. cancer is cause by uncontrolled growth of abnormal cells
Down
- 1. two tubes connected to the lungs
- 2. smoke can lead to lung cancer
- 3. blood cells move oxygen to body cells
- 5. makes it hard to breathe
- 8. exchange of oxygen and carbon-dioxide occurs in the