the respiratory system

3. located inside the face, four pairs of air-filled spaces that produce nitric oxide that aids in oxygen uptake
4. a maneuver of forceful exhalation of air done by closing both the mouth and the nose and trying to breathe out
6. an airway in the lower respiratory tract, carries air into the lungs, the trachea separates into two and forms this
8. ridge of cartilage at the base of the trachea, separating the openings of the left and right primary bronchi
10. commonly known as the windpipe, cartilaginous tube that connects the larynx to the lungs
12. openings on the nose that allow air to be taken up into the lungs via breathing
13. most important muscle of respiration, separates the thoracic cavity from the abdomen
15. cup-shaped tiny, hollow cavities inside the lungs where gas exchange takes place
16. main organ of the respiratory system, is composed of two sides and protected by the ribcage against external damage
18. main component of the backup breathing system, necessary for vocalisation and talking
19. cartilaginous flap in the throat that acts as a valve, prevents food and liquids from entering the lungs through the trachea
22. name of the smaller airways inside the lungs, does not contain cartilage unlike the bronchi
24. main component of breathing and gas exchange, its chemical symbol is O and atomic number is 8

1. the proper name for breathing, process of moving air in and out of the lungs
2. set of bones encasing the thoracic cavity, protecting the heart and the lungs
5. layers of throat tissue that are key in speaking, they control the exhaled air by vibrating, which turns into vocalisation
7. membrane with fluid inside that lines the chest cavity
9. a common disease caused by allergens entering into the lungs, has no known cure
11. triangular dent which forms the root of the lung
14. latin word meaning "of, or relating to the lungs"
17. part of the brain responsible for the autonomic function of breathing
20. commonly known as the voice box, houses the vocal cords, involved in speaking and protecting the trachea, opens into the pharynx
21. located behind the nasal cavity, carries the food to the esophagus and air to the larynx
23. a sensory and respiratory organ, located in the middle of the face with the nasal cavity inside the head