Circulatory system

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Across
  1. 2. The wall that separates the left and right sides of the heart.
  2. 4. A blood vessel that carries blood away from the heart
  3. 5. A tiny blood vessel that has walls one cell thick.
  4. 8. A structure in the heart or veins that prevents backflow.
  5. 11. Organs where gas exchange takes place.
  6. 12. The largest artery that carries oxygenated blood from the heart to the body.
Down
  1. 1. blood cells Cells that defend the body against infection.
  2. 3. The liquid part of the blood in which cells are suspended.
  3. 6. Blood components that help with clotting.
  4. 7. blood cells Cells that contain haemoglobin and carry oxygen around the body.
  5. 9. A blood vessel that carries blood to the heart.
  6. 10. The muscular organ that pumps blood around the body.