10.6 Crossword Puzzle Activity Part 1

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Across
  1. 4. A protein that carries oxygen in red blood cells.
  2. 5. Muscular Middle layer of the heart
  3. 6. Valve located between the left atrium and left ventricle.
  4. 8. The smallest blood vessels in the body where gas exchange occurs.
  5. 10. The upper chamber of the heart.
  6. 12. A device used to record the electrical activity of the heart.
  7. 14. A blood vessel that carries oxygenated blood away from the heart.
  8. 15. The lower chamber of the heart.
  9. 16. The major vein that brings deoxygenated blood from the upper body to the heart.
Down
  1. 1. The major vein that brings deoxygenated blood from the lower body to the heart.
  2. 2. The largest artery in the body.
  3. 3. The valve between the left ventricle and the aorta.
  4. 7. A fatty substance that can build up in arteries and restrict blood flow. Down:
  5. 9. The period of heart muscle contraction.
  6. 11. The valve located between the right atrium and right ventricle.
  7. 13. The phase of the cardiac cycle when the heart is at rest.