Across
- 2. – Type of white blood cell that fights germs by engulfing them.
- 4. – Blood vessel that has valves to prevent backflow.
- 5. – The system that includes the heart and blood vessels.
- 6. – Protein in red blood cells that carries oxygen.
- 8. – Type of white blood cell that releases chemicals to kill germs.
- 9. – Blood vessel that carries blood away from the heart.
- 11. – A lower chamber of the heart that pumps blood out.
- 12. – A muscular organ that pumps blood through the body.
- 15. – The phase when the heart relaxes.
Down
- 1. – The phase when the heart contracts.
- 3. – Small branches of arteries leading to capillaries.
- 5. – The tiniest blood vessels where exchange with cells occurs.
- 7. – Type of blood cell that carries oxygen.
- 10. – Blood vessel that carries blood towards the heart.
- 13. – The upper chamber of the heart that receives blood.
- 14. – The liquid part of blood that carries nutrients and waste.