Heart crossword

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Across
  1. 4. when the atria contract and the ventricles are relaxed
  2. 6. layer of the heart that consists of muscle tissue
  3. 8. chordae tendineae attach to the _____ muscle
  4. 12. the walls of ventricles are lined with ________ carnae
  5. 14. fibers that cause the ventricles to contract
  6. 15. lines the inner layer of the heart
  7. 17. blood from the left ventricle enters the _________
  8. 18. the heart is regulated by the _____ nervous system
  9. 19. the _____ valve separates the right atrium and the right ventricle
  10. 20. the _____ arteries supply blood to the myocardium
Down
  1. 1. the _____ node is the heart's pacemaker
  2. 2. the ______ valve lets oxygen-rich blood pass from the left atrium into the left ventricle
  3. 3. the right atrium receives ________ blood
  4. 5. blood from the left ventricle enters the _____ system
  5. 7. the double layered membrane that surrounds the heart
  6. 8. valve between the right ventricle and pulmonary artery
  7. 9. the electric signal generated in the sinus node, then flows to the _____ node
  8. 10. a ____ ensures that blood only flows in one direction
  9. 11. the _____ separates the two sides of the heart
  10. 13. blood from the right ventricle enters the _____
  11. 16. the ______ ovale lets blood pass between the right and left atrium (in a fetus)