The Heart

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Across
  1. 2. Protein in red blood cells that binds with oxygen
  2. 4. Phase in the cardiac cycle when the heart contracts
  3. 6. Red blood cells responsible for transporting oxygen
  4. 9. Blood vessels that carry blood towards the heart
  5. 10. The 2 upper chambers of the heart
  6. 11. Thin membrane lining the inside of the heart
  7. 12. Another word for the SA node that regulates heartbeat
Down
  1. 1. White blood cells that help protect the body from infection
  2. 3. Muscular organ that pumps blood throughout the body
  3. 5. Watery fluid in blood that transports nutrients and waste.
  4. 7. Platelets that play a role in blood clotting
  5. 8. Muscular wall dividing the left and right side of the heart