Structure of the Heart

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Across
  1. 1. The lower chambers of the heart
  2. 3. The valve before the Pulmonary Artery
  3. 5. This word means lungs
  4. 7. The largest blood vessel in the body
  5. 8. Veins where blood returns to the heart
  6. 11. The squeezing of the heart to pump blood through the body
  7. 12. The relaxation of the heart to let blood enter it
  8. 13. Blood is brought back to the heart in here
Down
  1. 2. The small blood vessels that separate the veins and arteries
  2. 4. This word is means all around the body
  3. 6. The valve right before the aorta
  4. 7. The upper chambers of the heart
  5. 9. Blood is taken away from the heart in here
  6. 10. This patch of muscle divides the two chambers