cardiovascular system

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Across
  1. 2. Cell fragments involved in blood clotting
  2. 4. Red blood cells responsible for transporting oxygen
  3. 11. Recording of electrical activity of the heart showing P QRS and T waves
  4. 13. Largest artery in the body carrying blood from the left ventricle
  5. 14. White blood cells that develop into macrophages in tissues
  6. 17. White blood cells involved in allergic reactions and parasite defense
  7. 18. Microscopic vessels where exchange of gases nutrients and wastes occurs
  8. 19. Specialized connective tissue that transports oxygen nutrients and wastes in the body
Down
  1. 1. Blood vessels that carry blood away from the heart
  2. 2. Liquid component of blood that makes up about 55 percent of blood volume
  3. 3. Process of blood cell production in bone marrow
  4. 5. Protective sac surrounding the heart
  5. 6. Inner lining of blood vessels that reduces friction during blood flow
  6. 7. Blood vessels that return blood to the heart
  7. 8. Rare white blood cells that release histamine during inflammation
  8. 9. Most abundant white blood cells that destroy bacteria by phagocytosis
  9. 10. Protein in red blood cells that binds oxygen
  10. 12. White blood cells responsible for specific immune responses
  11. 15. Thick muscular middle layer of the heart wall responsible for pumping
  12. 16. White blood cells that protect the body against infection