Cardiovascular System

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Across
  1. 2. Partition or wall dividing a cavity of the heart
  2. 4. Muscular middle layer of the heart
  3. 7. A waste product released by body cells
  4. 9. Structure in the veins or heart that temporarily closes an opening so that blood flows in only one direction
  5. 10. Gas that enters the blood through the lungs and travels to the heart to be pumped
  6. 11. Found between left atrium and left ventricle
  7. 12. 1 of 2 upper chambers of the heart
  8. 13. Large blood vessels that carry blood away from the heart
  9. 14. Innermost layer of epithelial cells
Down
  1. 1. Pathway of blood from the heart to the tissue capillaries and back to the heart
  2. 3. Beat of the heart
  3. 5. Double-layered membrane surrounding the heart
  4. 6. Oxygen-rich blood
  5. 8. The pathway of blood through the vessels from the heart to the lungs and then back to the heart again heart to the lungs
  6. 9. Small vein