Heart structure and circulation

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Across
  1. 3. circuit of vessels that carries blood between the heart and the tissues
  2. 4. valve structure between the left atrium and the left ventricle (2 words)
  3. 6. divides the left heart from the right heart
  4. 10. drains blood from body and lower extremities (3 words)
  5. 11. This vessel branches to send blood to both lungs (2 words)
  6. 12. another word for heart relaxation
  7. 14. From this chamber of the heart blood moves into pulmonary circulation
  8. 15. lining that surrounds the heart
  9. 17. node that is referred to as the “pacemaker of the heart”
  10. 19. forms the majority of the heart and is composed primarily of cardiac musle
  11. 20. takes blood from the left ventricle to all body systems
Down
  1. 1. structures where oxygen and carbon dioxide are exchanged with air
  2. 2. blood flows though the __________________ valve into the aorta (2 words)
  3. 5. bring oxygenated blood to the heart from the lungs (2 words)
  4. 7. drains blood from the head and upper extremities (3 words)
  5. 8. type of vessels that carry blood back toward the heart
  6. 9. smallest blood vessels
  7. 13. structure between right atrium and right ventricle (2 words)
  8. 16. This type of valve prevents blood from leaking backward into ventricles
  9. 18. the type of vessel that carries blood away from the heart
  10. 19. another word for bicuspid valve