1. THE RESPIRATORY SYSTEM
Main Function:
Exchanges oxygen and carbon dioxide between the blood, air & tissues

2. NOSE & MOUTH 1. Entryway for air 2. Nasal hairs filter air
3. Warm air before it travels to lungs

3. PHARYNX
Throat region;
Common pathway for air and food

4. Animated web link tutorial
EPIGLOTTIS
Flap that closes off the trachea when swallowing to prevent choking up
down
Animated web link tutorial

5. LARYNX
also called Voice box or Adam's apple;
contains vocal cords

6. TRACHEA Also called the windpipe; tube that carries air to lungs;
lined with cartilage rings to keep the trachea open

7. BRONCHI & BRONCHIOLES
Bronchi :Two smaller tubes that Branch off from trachea into each lung
Bronchioles: smaller tubes that branch out further into lung

8. ALVEOLI
Small air sacs responsible for exchanging gases with the blood

9. LUNGS Have large surface area for gas exchange
HEALTHY LUNG
Have large surface area for gas exchange
Right lung has three lobes; left lung has only two lobes (heart takes up space on left side)
LUNG CANCER
EMPHYSEMA

10. DIAPHRAGM
Muscular sheet under lungs that moves down as it contracts to bring air into the lung (INHALATION)
Air moves out of lung as diaphragm relaxes and moves upward (EXHALATION)

11. NOSE
PHARYNX
MOUTH
EPIGLOTTIS
LARYNX
BRONCHIOLES
TRACHEA
ALVEOLI
LUNGS
DIAPHRAGM
BRONCHI

12. MECHANICS OF BREATHING
Tutorial Web link

13. How Breathing is Controlled
1. Can somewhat control breathing
2. When you do not have enough oxygen, your chest begins to feel tight & throat burns
3. Medulla oblongata causes muscles in diaphragm & chest to contract & force air into lungs
4. Cells in medulla oblongata sense the CO2 content; when it is too high, it will cause you to inhale