Heart and Lungs

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Across
  1. 2. The membrane (double layer) that covers the lungs and lines the chest cavity.
  2. 3. The main branches from the trachea into each lung.
  3. 5. One of the two lower pumping chambers of the heart.
  4. 7. The major muscle that separates the chest cavity from the abdomen and helps with breathing.
  5. 13. Tiny air sacs in the lung where gas exchange occurs
  6. 14. Structure that prevents back-flow of blood through heart chambers
  7. 15. The process of breathing / gas exchange in the lungs.
  8. 17. The largest artery in the body; carries blood from the heart to the body
  9. 19. The muscular middle layer of the heart wall
  10. 20. The site on the lung where structures (bronchi, vessels) enter and exit.
Down
  1. 1. As in coronary arteries, the vessels supplying the heart muscle itself.
  2. 4. The wall dividing chambers (e.g., between ventricles or atria).
  3. 6. The “windpipe” tube leading to the lungs
  4. 8. One of the two upper chambers of the heart
  5. 9. Relating to the lungs (e.g., pulmonary artery).
  6. 10. A section of a lung (e.g., right lung has three lobes).
  7. 11. The sac surrounding the heart
  8. 12. Tiny blood vessels around alveoli where oxygen enters the blood and CO₂ leaves.
  9. 16. The valve between right atrium and right ventricle
  10. 18. The valve between left atrium and left ventricle (also called bicuspid)