Heart puzzle

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Across
  1. 1. pericardium
  2. 3. pulse
  3. 4. rhythme
  4. 6. space of walls tissue
  5. 7. chest
  6. 10. Heart
  7. 12. blood lymph
  8. 13. ather/o
  9. 14. mucus
Down
  1. 2. capillary
  2. 5. vien
  3. 8. valve
  4. 9. oxygen
  5. 11. vas/o
  6. 12. cyn/o