Across
- 7. Blood vessels that carry blood away from the heart.
- 8. Gas needed for energy production.
- 9. Organs where gas exchange takes place.
- 10. Organ that pumps blood throughout the body.
- 11. Tiny air sacs where gas exchange happens.
- 12. Main passageway for air into the lungs.
Down
- 1. Blood vessels that carry blood back to the heart.
- 2. Cells that help the blood clot.
- 3. Muscle that helps us breathe, located under the lungs.
- 4. Liquid that carries oxygen and nutrients.
- 5. Tiny branches of tubes connecting the bronchi to the alveoli.
- 6. Tubes that branch off the trachea.