Circulatory System Terms

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Across
  1. 4. blood vessels that carry blood away from the heart
  2. 7. blood vessels that carry blood back to the heart
  3. 8. a chamber of the heart that receives blood from an atrium and pumps it to the arteries
  4. 12. flap of tissue in the heart and large veins that prevents blood from flowing backwards
  5. 14. cells that are primarily responsible for transporting oxygen and carbon dioxide through the body
  6. 15. contraction phase of the heartbeat
  7. 16. located between the right ventricle and the pulmonary artery, a blood vessel that carries blood to the lungs
  8. 17. thick middle muscle layer of the heart
  9. 18. tiny, disk-shaped bodies in the blood, important in blood clot formation
Down
  1. 1. liquid portion of blood made up of water, dissolved salts, proteins, and other substances
  2. 2. pressure in the artery when the ventricles are relaxing and the heart is filling, receiving blood from the venae cavae and pulmonary veins
  3. 3. heart chamber that receives blood returning to the heart from other parts of the body
  4. 5. platelets which are important for the clotting process, which stops bleeding
  5. 6. pressure in the artery when the left ventricle is contracting to force the blood into the aorta and other arteries
  6. 9. blood cell that defends against infection by disease-causing bacteria and viruses
  7. 10. smallest blood vessels; materials are exchanged between the blood and the body's cells
  8. 11. relaxation of the heart
  9. 13. abnormal heart rhythms