1. CO2 O2
Respiratory System O2
CO2

2. Respiration exchange and transport of gases
carbon dioxide (CO2) leaves cells; oxygen (O2) enters
gas exchange occurs across moist membranes covered with blood vessels

3. Structure and Function

4. nose (nasal cavity) - warms, filters air as it enters body using nose hairs and mucus
larynx (voice box) - upper part of trachea; contains vocal cords, 2 bands of tissue stretched across opening of trachea
trachea -air passageway covered with epiglottis

5. bronchi - tubes that carry air from trachea to lungs
bronchioles - smaller tubes that branch from bronchi
lungs - sac-like organs; site of gas exchange between air and blood

6. trachea
bronchi
lungs
bronchioles
diaphragm - dome-shaped muscle that moves up & down in the breathing process

7. bronchioles
alveoli - grape-like clusters surrounded by network of thin-walled capillaries at the end of bronchioles

8. Inhalation
diaphragm
chest wall muscles contract, lifting and pulling ribs outward, diaphragm pulls downward

9. Exhalation
diaphragm
reverses the process

10. chest wall muscles contract, lifting and pulling ribs outward
Inhalation
Exhalation
diaphragm
chest wall muscles contract, lifting and pulling ribs outward
reverses the process

11. Gas Exchange

12. tissue
capillary
alveoli
CO2
Gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries. O2
CO2
CO2
CO2
CO2
CO2
CO2
CO2
CO2
CO2 O2
CO2 O2 O2 O2 O2 O2 O2 O2 O2 O2 O2
CO2
CO2

13. Diseases of the Respiratory System

14. asthma
narrowed airways, caused by allergies which clog airways with mucus and produce muscle spasms
cystic fibrosis
genetic defect which causes excessive production of mucus that clogs airways
bronchitis
inflammation of bronchi, bronchioles caused by long-term exposure to allergens, cigarette smoke, or other irritants

15. Review

16. Name the structure.
nasal cavity 1 5
lung
larynx 2 6
bronchi
trachea 3
bronchioles 4 7
diaphragm

17. Match the structure with the number.1. 2. 5. 3.
nasal cavity
bronchioles
diaphragm
bronchi
trachea
larynx
lung 6. 4. 7.

18. sac-like organs; site of gas exchange between air and blood
Match the function with the number. 1.
sac-like organs; site of gas exchange between air and blood
dome-shaped muscle that moves up & down in the breathing process
tubes that carry air from trachea to lungs
air passageway covered with epiglottis
warms, filters air as it enters body
smaller tubes that branch from bronchi
upper part of trachea; contains vocal cords 5. 2. 3. 6. 4. 7.

19. 1. 5. 2. 6. 3. 4. 7.

20. tissue
capillary
alveoli
CO2
Gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries. O2
CO2
CO2 O2 O2 O2 O2
CO2
CO2