The heart

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Across
  1. 4. a one-way opening
  2. 6. blood vessel that carries blood away from the heart
  3. 8. an organ that contains oxygen
  4. 9. a sequence of events in which the heart contracts and relaxes
Down
  1. 1. main artery, carries oxygenated blood from heart to body
  2. 2. pumps blood to lungs and body
  3. 3. the organ that pumps blood through the body
  4. 4. blood vessel that carries blood towards the heart
  5. 5. receives blood from lungs and body
  6. 7. liquid that flows through the body, carrying oxygen, waste and nutrients