The heart and blood vessels

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