Cardiovascular system

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Across
  1. 3. BPM (sinus rhythm) above 100
  2. 7. This artery takes blood to the lungs
  3. 9. These spread the electrical signals for the heart to pump
  4. 13. This is where the electrical stimulus starts
  5. 14. These chambers pump blood away
  6. 15. The largest artery
Down
  1. 1. Inner layer of heart made of epithelial cells
  2. 2. Smaller than veins
  3. 4. This occurs to reduce peripheral resistance
  4. 5. The cells that make up heart muscle
  5. 6. The top BP reading
  6. 7. Tough outer layer of the heart
  7. 8. The outermost layer of veins and arteries
  8. 10. This layer of the heart is made from muscle
  9. 11. Smaller than arteries
  10. 12. This increases by 50% when pregnant