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