Circulatory system

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Across
  1. 3. chambers that receive blood.
  2. 5. blood vessels that have valves
  3. 6. heart initiates and maintains its own rhythm is said to be
  4. 8. muscular wall that separates the heart
  5. 10. muscles of the heart
  6. 12. carry blood under high pressure
  7. 13. form in which oxygen is transported in the blood.
Down
  1. 1. chamber that pumps blood under high pressure
  2. 2. initiates the heart rhythm
  3. 4. structure that separates opens from the left atrium
  4. 7. muscular organ that pumps blood
  5. 9. artery that supplies the heart muscles with nutrients
  6. 11. fight against infections