Cardiovascular System Crossword

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Across
  1. 5. the middle muscle/layer of the heart
  2. 7. the outermost muscle/layer of the heart
  3. 8. smallest blood vessels in the body
  4. 11. also known as RBC
  5. 13. The innermost muscle/layer of the heart, thinnest layer
  6. 15. also known as WBC
Down
  1. 1. large vein carrying deoxygenated blood to the heart
  2. 2. upper cavities of the heart
  3. 3. arteries that carry deoxygenated blood to your lungs
  4. 4. veins carrying oxygenated blood from your lungs to your heart
  5. 6. carrying deoxygenated blood from the body to the heart
  6. 9. carrying oxygenated blood away from the heart
  7. 10. the largest artery in the human body, at the top of the heart
  8. 12. also known as platelets
  9. 14. lower cavities of the heart