science vocabulary

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Across
  1. 4. Veins:
  2. 7. hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation.
  3. 9. Vena Cava:
  4. 11. and Left Atrium:
  5. 12. he chemical element of atomic number 8 and the life-supporting
Down
  1. 1. a device for controlling the passage of fluid
  2. 2. Dioxide:gas produced by burning carbon
  3. 3. Vena Cava:
  4. 5. any of the fine branching blood vessels
  5. 6. of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen
  6. 8. :any of the muscular-walled tubes forming part of the circulation system
  7. 10. and Left Ventricle: