The Heart

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Across
  1. 1. Tube forming part of the blood circulation system of the body
  2. 3. The main artery of the body
  3. 5. Organ that pumps blood
  4. 7. valves Each of a pair of valves in the heart
  5. 8. Each of the two upper cavities of the heart
Down
  1. 1. Each of the two main chambers in the heart
  2. 2. A muscular walled tube forming part of the circulation system
  3. 4. valve Either of two heart valves through which blood flows
  4. 6. Movement of blood to and fro or around something