1. The Respiratory System
Lungs
Organs in which gas exchange takes place
Muscle called diaphragm controls lung size (bottom of ribs)

2. Air flow follows a path Nose Enter
Nostrils lead to nasal passages that contain:
a. mucus membranes- make snot
b. cilia (hairs)- trap stuff
c. capillaries- warm up air
2. Pharynx
throat

3. 3. Larynx
Also called voice box (vocal cords)
Epiglottis blocks opening to prevent choking

4. 4. Trachea
Also called the windpipe
Rings of cartilage keep it open
Lined with cilia (trap)

5. Found at the end of the trachea where it splits into two
5. Bronchi
Found at the end of the trachea where it splits into two
Cilia and mucus (trap)
Bronchi bronchial tubes  bronchioles  alveoli
YouTube - The respiratory system
6. Alveoli
Small grape like sacs
One cell thick
Surrounded by capillaries (diffusion of gases)

6. Know the Pathway

7. The Science of Breathing
Divide into two parts:
Breathing
Gas exchange

8. Controlled by medulla (brain) and levels of Carbon Dioxide in blood
Breathing
Controlled by medulla (brain) and levels of Carbon Dioxide in blood
Air goes in and out of the lungs
Inhale- ribs up and out, diaphragm down
Exhale- ribs and diaphragm relax

9. 2. Exchange
a. External- exchange in lungs

10. Internal- exchange in cells
YouTube - Respiration 3D Medical Animation

11. Respiratory Disorders
Asthma- allergic reaction to something resulting in closed airways
Bronchitis- inflammation of the lining of the bronchial tubes
Emphysema- scar tissue in alveoli