The heart

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Across
  1. 3. valve at exit of left atrium
  2. 4. muscles in ventricular wall attached to chordae tendinae
  3. 6. two cusps on the left side
  4. 8. cranial nerve associated with sinoatrial node
  5. 9. valves associated with the heart prevent this
  6. 12. heart strings
  7. 13. superior region of heart
  8. 14. contraction phase
  9. 15. hearts natural pacemaker
  10. 16. receives deoxygenated blood from systemic circuit
  11. 17. middle layer of heart muscle
  12. 18. pumps blood to pulmonary circuit
Down
  1. 1. artery where right and left coronary arteries exit
  2. 2. three cusps on the right side
  3. 4. valve preventing backflow into right ventricle
  4. 5. relaxation phase
  5. 7. pumps blood to systemic circuit
  6. 10. inferior point of heart
  7. 11. receives oxygenated blood from pulmonary circuit