Circulation

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Across
  1. 4. Number of heart chambers
  2. 8. Veins have this structure to prevent blood back flow
  3. 10. Relaxation of the heart chambers
  4. 12. Blood types can be positive or negative based on this factor
  5. 13. O- is the universal _
  6. 14. A type of white blood cell which produces antibodies
Down
  1. 1. Blood vessel with an outer wall that is 1 cell thick
  2. 2. The shape of red blood cells
  3. 3. The right side of the heart pumps _ blood
  4. 5. A monosaccharide found dissolved in plasma
  5. 6. Red blood cells are broken down into this
  6. 7. AB _ is the universal receiver
  7. 9. Contraction of the heart chambers
  8. 11. A blood vessel with a narrow lumen