The Circulatory system

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