Circulatory System

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Across
  1. 1. a waste, made by cells, which the blood carries to the lungs to be exhaled
  2. 3. Fluid that carries oxygen
  3. 5. Carry blood away from the heart
  4. 6. Take blood back to the heart
  5. 7. The main organ
  6. 8. Main part of respiratory system
Down
  1. 1. connects veins and arteries
  2. 2. control blood flow and allow the blood to flow in one direction
  3. 4. Carried by the blood to make energy