The Circulatory System

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Across
  1. 4. A thick-walled vessel that carries oxygenated blood throughout the body
  2. 6. The muscular layer of the heart wall
  3. 7. The study of the structure of blood and the tissues that form blood
  4. 10. The iron containing pigment in red blood cells that carries oxygen
  5. 13. A thin layer that lines the interior of the heart
  6. 14. Another term for “platelet”
  7. 15. The clear, straw colored, liquid portion of blood
  8. 16. A thin-walled vessel that returns deoxygenated blood to the heart
Down
  1. 1. A microscopic vessel that creates a network between arteries and veins
  2. 2. A thin layer that lines the surface of the heart
  3. 3. The production and formation of blood cells
  4. 5. White blood cell
  5. 8. Lack of blood
  6. 9. The fibrous sac that encloses the heart
  7. 11. Red blood cell
  8. 12. Transparent, whitish-yellow liquid that contains white blood cells