Science Chapter 12

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Across
  1. 5. largest artery in your body
  2. 7. the number of times your heart beats per minute is your heart ____.
  3. 8. the liquid part of the blood
  4. 10. blood flows in only ___ direction
  5. 11. William ____ was the first person to understand how blood circulates
  6. 12. ____ blood cells that carry oxygen to all the parts of your body
  7. 14. hollow organ with walls made of strong muscle
  8. 15. bean-shaped organs that clean your blood
Down
  1. 1. there are ____ main blood types
  2. 2. blood vessels connecting arteries and veins
  3. 3. blood vessels that carry blood away from the heart
  4. 4. small flap of tissue that stops blood from flowing backwards
  5. 6. blood vessels that carry blood to the heart
  6. 8. the push of blood through your vessels as your heart beats
  7. 9. help form blood clots
  8. 13. ____ blood cells help the body fight infection