The Respiratory System
Across
- 2. The more commonly-used name for the 'pharynx'.
- 5. One of the many passageways which branch off of the bronchi within the lungs.
- 7. A large muscle which controls the size of the chest cavity. It contracts and then relaxes to enable a person to breath in and out, respectively.
- 9. The number of lungs, nostrils and bronchi humans have.
- 11. Forms the initial part of the digestive system, in addition to one of the initial parts of the respiratory system - the _______ cavity.
- 12. The 'primary' organs of the respiratory system.
- 13. The tubes which lead into each lung from the trachea.
- 14. Our voice box
- 16. The hollow space located within the skull, behind the nose - nasal ____________.
- 17. The waste gas that we remove from the bloodstream and expel out into the air - carbon ___________.
- 18. The opposite of exhalation.
- 20. A reflex that humans use to expel potenially-harmful pathogens and irritants from the respiratory tract.
- 21. The millions of tiny sacs, within our lungs, that are responsible for the exchange of gases into/out of the bloodstream.
Down
- 1. CO2 is produced as a toxic bi-product of this chemical process that occurs within our cells.
- 3. The hairs which line the inside of nostrils are used to __________ out dust and coarse particles.
- 4. The process of producing sound from the mouth, using the vocal cords.
- 6. The rings that prevent the trachea from collapsing are made from this type of tissue.
- 8. The process of taking in and pushing out air from the lungs/mouth/nose.
- 10. The gas that we take in from the atmosphere and deliver to our bloodstream.
- 15. CO2 can influence this property of blood, since it combines with water to form weak acid.
- 19. The correct scientific name for the "windpipe".