Circulatory System

123456789
Across
  1. 4. prevents blood from going backwards in the system
  2. 5. carries no air blood
  3. 6. muscle thick layer of the heart
  4. 8. carries air blood
  5. 9. receives blood from the circulatory system
Down
  1. 1. small blood vessels that connect the arteries and veins to the heart
  2. 2. makes the beat and tells the heart when to pump
  3. 3. pumps blood to the rest of the body
  4. 4. cava largest vein that carries blood away from the heart
  5. 7. separates the two sides of the heart
  6. 8. also carries air blood