Heart Crossword Puzzle

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Across
  1. 4. structures located within the heart that regulate blood flow between the heart's chambers
  2. 5. any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood toward the heart.
  3. 6. relating to the heart
  4. 8. any of the muscular-walled tubes forming part of the circulation system by which blood is taken to all parts of the body via the heart
  5. 9. each of the two upper cavities of the heart from which blood is passed to the ventricles
Down
  1. 1. any of the fine branching blood vessels that form a network between the arterioles and venules.
  2. 2. an artificial device for stimulating the heart muscle and regulating its contractions.
  3. 3. each of the two main chambers of the heart, left and right
  4. 4. a vein
  5. 7. a partition separating two chambers, such as that between the nostrils or the chambers of the heart.
  6. 8. the main artery of the body, supplying oxygenated blood to the circulatory system