Circulatory System Crossword Puzzle

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Across
  1. 5. a blood cell that carries oxygen throughout the body.
  2. 7. either of the two upper chambers of the heart that receives blood from veins.
  3. 11. the body system that includes the heart, blood vessels, and blood. The circulatory system transports oxygen, nutrients, and other materials to cells. The circulatory system removes carbon dioxide, urea, and other wastes from cells.
  4. 12. the muscular organ that pumps blood throughout the body. The human heart contains four chambers: the right atrium, the right ventricle, the left atrium, and the left ventricle.
  5. 13. a blood vessel that carries blood to the heart. Except for the pulmonary vein, all veins transport oxygen-poor blood.
  6. 15. a small blood cell that helps the blood to clot.
Down
  1. 1. structures that open and close to control blood flow through the heart. Heart valves only allow blood to flow in one direction. There are four valves in the heart.
  2. 2. a tiny blood vessel. Capillaries exchange oxygen, glucose, and other materials with body cells.
  3. 3. the artery that carries blood from the right ventricle to the lungs.
  4. 4. a blood vessel that carries blood away from the heart. Except for the pulmonary artery, all arteries transport oxygen-rich blood.
  5. 6. a tube in the body through which blood flows. Adult humans have over 40 billion blood vessels. Stretched end to end, they would circle the Earth four times!
  6. 8. the vein that carries blood from the lungs to the left atrium.
  7. 9. a blood cell that fights infection by destroying microscopic, disease-causing organisms.
  8. 10. a waste product in the blood that comes from the breakdown of proteins.
  9. 14. either of the two lower chambers of the heart that pumps blood through arteries.