Circulatory System Crossword

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Across
  1. 2. Where the blood cells pick up oxygen
  2. 6. Receiving system of the heart
  3. 7. Blood vessels leading away from the heart
  4. 11. Blood vessels returning to the heart
  5. 12. How you can feel your heart rate
  6. 13. exercise that uses oxygen
  7. 15. Exercise __________ (speeds up) your heart rate
  8. 16. Nerve that slows down the heart
Down
  1. 1. only artery that carries oxygen-poor blood
  2. 3. Word that means 'blood vessels'
  3. 4. Word that means 'heart'
  4. 5. Percent of your body's blood in your arteries at any given time
  5. 8. What pumps the blood
  6. 9. Body's main artery
  7. 10. Blood cell that allows for clotting
  8. 14. muscle that is called the "second heart"