The heart

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Across
  1. 1. - The protein in red blood cells that binds with oxygen.
  2. 3. - Red blood cell responsible for oxygen transport.
  3. 7. - Blood vessel carrying blood toward the heart.
  4. 8. - One of the two lower chambers of the heart.
  5. 9. - The liquid part of blood that transports nutrients and hormones.
  6. 12. - A type of white blood cell that engulfs harmful bacteria.
  7. 13. - One of the two upper chambers of the heart.
  8. 14. - White blood cell that helps defend the body.
  9. 16. systole - Phase when ventricles contract to pump blood out.
  10. 18. - Platelet cell involved in blood clotting.
  11. 19. systole - Phase when atria contract and push blood into ventricles.
  12. 20. - Tiny blood vessel where exchanges with cells occur.
Down
  1. 2. - Thin membrane lining the heart's interior.
  2. 4. cycle - Complete sequence of a heartbeat.
  3. 5. - The organ that pumps blood throughout the body.
  4. 6. - The muscular wall that divides the heart's left and right sides.
  5. 10. valves - Valves that control blood flow from ventricles to arteries.
  6. 11. - Another term for the SA node, which regulates heartbeat.
  7. 15. - Instrument used to listen to the heartbeat.
  8. 17. - Blood vessel carrying blood away from the heart.