The Circulatory System

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Across
  1. 4. The main artery from the left side of the heart that carries oxygen rich blood to body cells.
  2. 5. The part of your blood pressure when the heart is contracted.
  3. 6. The center layer of heart muscle that is mostly cardiac tissue.
  4. 10. The covering of the heart.
  5. 11. A valve that separates the right atrium from the right ventricle.
  6. 12. A semilunar valve that keeps blood from flowing back into the right side of the heart.
  7. 15. The lower chamber of the heart
  8. 16. The muscle that divides the two sides of the heart.
  9. 17. Node - The pacemaker of the heart.
Down
  1. 1. The term that means lungs and describes the arteries and veins that go to and from the lungs.
  2. 2. The side of the heart that has low oxygen blood.
  3. 3. The chemical in blood that carries oxygen.
  4. 7. The upper chamber of the heart
  5. 8. A valve that separates the left atrium from the left ventricle.
  6. 9. A semilunar valve that keeps the blood from flowing back into the left side of the heart.
  7. 13. The side of the heart that has high oxygen blood.
  8. 14. The part of your blood pressure when the heart is relaxed.
  9. 15. The two veins that bring low oxygen blood to the right side of the heart.