Respiratory system

2. Each lung is divided into lobes by _____.
6. Results when blood becomes alkaline, extremely slow or shallow breathing
9. pleura lines the walls of the thoracic cavity.
12. coasts gas-exposed alveolar surfaces.
14. increases surface area and Increases air turbulence
16. Where the base of the lungs rest
17. no-respiratory air movements
19. Respiratory rate of 12 to 18 rpm
20. sets basic rhythm of breathing and contains a pacemaker (self-exciting inspiratory centre) called the ventral respiratory group (VRG)
21. O2 Binds to Haemoglobin of red blood cells to form ________.

1. breathing sounds of soft sound of air filling alveoli
3. sounds of air rushing through large passageways such as the trachea and bronchi
4. appears to smooth out respiratory rate
5. smell receptors in the superior surface of the nose
7. pleura covers the lung surface.
8. Volume of air that remains in lungs after expiration
10. inferior region attached to the larynx
11. Cavities within bones surrounding the nasal cavity
13. Rising levels of CO₂ in the blood (acidosis) result in faster, deeper breathing
15. Tonsil located in the nasopharynx
18. Alveoli permanently enlarged as adjacent chambers break through and are destroyed