Across
- 2. – Muscle that helps in breathing.
- 3. – Structure covering the trachea during swallowing.
- 5. – The process of taking in air.
- 7. – Organ where gas exchange happens in humans.
- 8. - Tiny hair-like structures that trap dust in the respiratory tract
- 11. – The system that transports oxygen and nutrients.
- 12. – Blood vessels carrying blood away from the heart.
- 13. – Blood vessels that carry blood back to the heart.
- 14. – Red blood cell pigment that carries oxygen.
- 15. - Tubes that carry oxygen into the lungs
Down
- 1. - Smallest blood vessels where exchange of gases occurs
- 4. - Gaseous waste removed by the lungs
- 6. - Thin wall separating the right and left sides of the heart
- 9. - The large artery that carries blood from the heart to the body
- 10. - prevents backflow of blood
- 12. – Tiny air sacs in lungs where gas exchange occurs.