Circulatory System

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Across
  1. 1. carry blood towards heart
  2. 5. divider of left and right half
  3. 8. flat discs do not have nuclei
  4. 11. small discs that do not have nuclei
  5. 12. exchange of substances
Down
  1. 2. thin membrane inside heart
  2. 3. have a nucleus
  3. 4. lower chamber
  4. 6. upper chamber
  5. 7. carry blood away from heart
  6. 9. lies between the left atrium and left ventricle
  7. 10. contraction of heart which pumps blood into the aorta and pulmonary artery