1. Why do we yawn?

2. Why do we yawn?
Get rid of CO2
Stretch
Stay alert
Nervousness
Communicate to others to stay alert
Cool the brain
Neurotransmitters
Warning display (Baboons)

3. Why is yawning contagious?
Mirror neurons

4. Normal
alveoli
Emphysema Alveoli

5. Emphysema

8. condition in which the alveoli deteriorate, causing the lungs to
Malfunctions & Diseases of the Respiratory System
EMPHYSEMA
condition in which the alveoli
deteriorate, causing the lungs to
lose their elasticity

11. asthma http://www.youtube.com/watch?v=aGDi5tI5vTk

12. Malfunctions & Diseases of the Respiratory System
asthma
severe allergic reaction characterized by
the constriction of bronchioles
bronchitis
inflammation of the lining of the
bronchioles

15. Malfunctions & Diseases of the Respiratory System
lung cancer
irregular & uncontrolled growth of
tumors in the lung tissue

16. Pneumonia in upper right lung

17. Malfunctions & Diseases of the Respiratory System
Pneumonia
condition in which the alveoli become filled with fluid, preventing the exchange of gases

19. Bird Flu The Next Pandemic?
25 min

20. Mycobacterium tuberculosis

21. Alveoli with tuberculosis
Normal
Alveoli
Alveoli with tuberculosis

22. tuberculosis

23. Infection with bacterium Mycobacterium tuberculosis.
mainly affects and damages the lungs,
but the bacterium may spread to any
other organ system.
slowly progressive and chronic
if untreated and death may result.

24. Humans usually acquire infection by breathing in infectious droplets, which have been expelled from the respiratory tract of infected persons.

25. Some forms are antibiotic resistant.
Treatment with antibiotics is available, but must be administered over many months to achieve remission.
Some forms are antibiotic resistant.