Cardiovascular System

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Across
  1. 2. The circulation of blood through the vessels between the heart, the lungs, and back.
  2. 5. Gas (waste) released by body cells.
  3. 6. Vessels that carry oxygenated blood from the lungs to the heart.
  4. 8. Lower chambers of the heart.
  5. 14. Arteries, veins, and capillaries.
  6. 15. Double-layered membrane surrounding the heart.
Down
  1. 1. Three leaflets or cusps valve.
  2. 3. Structure that prevents the backflow of blood and keeps the blood moving in one direction inside the veins.
  3. 4. Muscular middle layer of the heart.
  4. 7. Blood vessels with elastic walls to expand.
  5. 9. Innermost layer of epithelial cells.
  6. 10. Blood vessels that have walls with only one endothelial cell in thickness.
  7. 11. Two common arteries located on each side of the neck.
  8. 12. The beat of the heart that is felt through the walls of arteries.
  9. 13. Lower tip of the heart.