The Circulatory System

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Across
  1. 4. Blood cell required for the clotting process
  2. 5. Blood vessel that connects arterioles with venules
  3. 9. Valve between the left atrium and left ventricle
  4. 14. Valve between the left ventricle and the aorta
  5. 15. Blood vessel that carries blood back to the heart
  6. 16. Period of ventricular contraction in the heart
  7. 17. Smooth layer of cells lining the inside of the heart
  8. 18. Upper chamber of the heart
  9. 19. Double-layered membrane on the outside of the heart
Down
  1. 1. Lower chamber of the heart
  2. 2. Brief period of rest in the heart
  3. 3. Valve between the right ventricle and pulmonary artery
  4. 6. Blood vessel that carries blood away from the heart
  5. 7. Tissue that flows through the circulatory system
  6. 8. Complex protein on red blood cells
  7. 10. Muscular middle layer of the heart
  8. 11. Blood cell that carries oxygen and carbon dioxide
  9. 12. Blood cell that helps fight infection
  10. 13. Fluid portion of the blood
  11. 16. Muscular wall that separates the heart into a right and left side