The Respiratory and Circulatory Systems

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Across
  1. 2. each of the two upper chambers of the heart that receives blood that comes into the heart
  2. 4. the largest artery in the body
  3. 7. Left and right tubes that connects the trachea to the lungs.
  4. 8. the alternating expansion and relaxation of an artery wall as blood travels through an artery
  5. 9. the wall of tissue that separates the right side of the heart from the left side of the heart
  6. 10. tiny blood vessels where substances are exchanged between the blood and the body cells
  7. 14. Breathing begins with a dome-shaped muscle located at the bottom of the lungs.
  8. 16. each of the two lower chambers of the heart that pumps blood out of the heart
  9. 17. It has 3 lobes: superior, middle, and inferior and it is the larger of the two lungs.
  10. 18. blood vessels that carry blood back to the heart
  11. 19. The main organ of the respiratory system.
Down
  1. 1. commonly called the voice box, and a connection between the pharynx and trachea
  2. 3. the liquid part of blood; it is 90% water
  3. 5. It is the tiny sac like structure present in the lungs which the gaseous exchange takes place.
  4. 6. It is also known as windpipe, it filters the air we inhale and branches into the bronchi.
  5. 8. a group of cells located in the right atrium that sends out signals that make the heart muscle contract and that regulates heart rate.
  6. 11. It is a leaf-shaped flap of cartilage which covers the opening of the trachea to keep food out when we swallow.
  7. 12. Tube that connects the mouth to the larynx and esophagus.
  8. 13. blood vessels that carry blood away from the heart.
  9. 15. It has 2 lobes: superior and inferior and it is the smallest of the two lungs.