Across
- 2. Dioxide – Waste gas exhaled from the body.
- 7. – Related to the lungs.
- 8. – The muscle that helps in breathing.
- 9. – Blood vessels that carry blood away from the heart.
- 11. – The process by which gases move from high to low concentration.
- 12. – Tiny air sacs in the lungs where gas exchange occurs.
- 14. – A chamber of the heart that pumps blood.
Down
- 1. – Gas essential for cellular respiration.
- 3. – Small branches of the bronchi leading to alveoli.
- 4. – A protein in red blood cells that carries oxygen.
- 5. – The main artery carrying oxygenated blood from the heart.
- 6. – Another name for red blood cells.
- 7. – The liquid component of blood.
- 10. – Small blood vessels where oxygen and carbon dioxide are exchanged.
- 13. – Blood vessels that return blood to the heart.