Have a heart!

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Across
  1. 3. Pressure: Needs to be controlled.
  2. 6. Bag surrounding the heart.
  3. 8. Largest artery; carries blood from the heart to the body.
  4. 9. Vessel that returns blood to the heart.
  5. 10. Valve between right atrium/ventricle.
  6. 12. Lower chambers of the heart.
Down
  1. 1. Muscles.
  2. 2. Involuntary muscle tissue.
  3. 4. Improves heart health.
  4. 5. Chambers that receive blood.
  5. 6. Artery: Connects lungs and heart.
  6. 7. Passage that closes to let fluid out.
  7. 11. Wall dividing the heart cavities.