Structures of the Heart

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Across
  1. 2. cardiac muscle layer forming the bulk of the heart; layer that contracts
  2. 3. blood is pumped out of heart and toward the lungs
  3. 5. largest artery in the body;Pumps oxygenated blood to all the tissues of the body
  4. 7. separates the ventricles
  5. 8. blood returns to left side of the heart from lungs
  6. 10. chamber that receives oxygenated blood returning from the lungs
  7. 14. site of gas exchange;blood becomes freshly oxygenated and drops off carbon dioxide gas
  8. 15. atrioventricular (AV) valve between the right atrium and ventricle;Prevents backflow of blood into right atrium
  9. 16. veins returning blood from the body to right side of heart
  10. 18. pulmonary trunk divides into right & left pulmonary arteries;Carry blood to the lungs
  11. 19. atrioventricular (AV) valve between the left atria and ventricle;Prevents backflow of blood into the left atrium
Down
  1. 1. found between right ventricle and pulmonary trunk;Prevents backflow of blood into the right ventricle
  2. 4. smallest blood vessel of the cardiovascular system; come in direct contact with our tissues for gas exchange
  3. 6. thickest walls of all 4 chambers; needs to be able to pump blood out to the body
  4. 9. chamber that receives deoxygenated blood returning from circulation
  5. 11. layer of the inner myocardial surface
  6. 12. lower chamber of the heart;More muscular than right atrium;Squeezes to pump blood into lungs
  7. 13. outermost layer; infiltrated with fat
  8. 17. found between left ventricle and aorta;Prevents backflow of blood into left ventricle