The Heart Crossword

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Across
  1. 3. / We can't live without it.
  2. 4. / Smooth inside lining of the heart.
  3. 7. / An average heart pumps 70 milliliters per ________.
  4. 8. / (RA).
  5. 10. / The heart is a ______ organ.
  6. 11. / The natural pacemaker of the heart is called the _________.
  7. 13. / The first heart sound .
  8. 14. / Leading cause of death in the United States.
  9. 15. / The heart is located between the ______.
  10. 17. / Increase in speed.
  11. 19. / The middle layer of the heart muscle.
Down
  1. 1. / When the heart muscle relaxes.
  2. 2. / The myocardium is surrounded by the ________.
  3. 5. / Deeply felt.
  4. 6. / (RV).
  5. 9. / Found at the exit of the left atrium.
  6. 11. / A doctor listens to your heart with a ___________ .
  7. 12. / The ________ valve is at the exit of the right atrium.
  8. 16. / The breastbone.
  9. 18. / (LA).