Circulatory System

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Across
  1. 2. _____ are tubes that carry blood back to the heart.
  2. 3. The heart has ___ layers.
  3. 5. What parts act like doors that control blood flow in the heart?
  4. 7. blood that’s low in oxygen is sent to the ___.
  5. 9. A blood vessel that takes blood AWAY from the heart to the body’s organs is called ___.
  6. 10. ____ are the smallest blood vessels in your vascular system.
  7. 11. Where does blood get oxygen from?
Down
  1. 1. The heart has ___ chambers.
  2. 2. The two larger lower chambers are called ___.
  3. 4. What main organ is incorporated in the circulatory system?
  4. 6. The circulatory system pumps ___ from the heart to the lungs to get oxygen.
  5. 8. The left and right side is divided by a wall called the ___.
  6. 9. The two upper chambers are called ___.