The heart and blood vessels

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Across
  1. 1. The heart has four ________.
  2. 2. The part marked ‘2’ in the diagram.
  3. 6. The part marked ‘1’ in the diagram.
  4. 7. The heart pumps this around the body.
  5. 10. The type of blood in the right hand side of the heart.
  6. 12. The part marked ‘4’ in the diagram.
  7. 13. A high tech piece of equipment used to measure pulse rate.
Down
  1. 1. A type of blood vessel that is only one cell thick.
  2. 3. The part marked ‘3’ in the diagram.
  3. 4. The type of blood in the left hand side of the heart.
  4. 5. These stop blood flowing in the wrong directions.
  5. 8. The heart is made of this.
  6. 9. Type of blood vessel that takes blood to the heart.
  7. 11. Type of blood vessel that takes blood away from the heart.
  8. 14. The side of the heart which has the thickest muscle.