1. Warm Up

2. THE PATHWAY OF AIR
Notes

3. 1. Nasal Cavity (or oral cavity)
Air enters the body through the nostrils (your nose) most of the time
It is lined with a ciliated mucus membrane which filters, warms, and moistens the air

4. 2. Pharynx
Where the oral cavity (your mouth) and the nasal cavity (your nose) meet.
When you breathe through your mouth, air enters the pharynx.

5. 3. Trachea The main airway in the human respiratory system.
It contains rings of a tough tissue (cartilage) which keep the trachea open.

6. Larynx Also known as the voice box.
It is made of cartilage and is located at the upper end of the trachea.
When air passes over it, it vibrates. (hum so I know you are reading this)

7. Epiglottis Trachea Esophagus
A flap of tissue that covers the trachea when you swallow so food doesn't enter
Trachea
Esophagus

8. 4. Bronchi Two tubes that branch off the trachea.
Bronchi is plural. Both bronchi
Bronchus is singular. One bronchus.
Two tubes that branch off the trachea.
The bronchi are ringed with cartilage.
Each bronchus extends to the lungs where the tubes become smaller.

9. 5. Bronchioles
Smaller and smaller passageways that extend from each bronchus.
The bronchioles are found in the lungs and not ringed with cartilage.

10. 6. Alveoli
Oxygen leaves the alveoli, enters the red blood cells and is returned to the heart to be pumped to all your body cells.
Carbon dioxide is exhaled when you breathe out.
The lungs are made of about 300 million of these tiny air sacs.
When you breathe in air fills the alveoli.

11. Gas Exchange in the Alveoli

12. Use during Lab to show how the diaphragm works

13. Don’t Smoke!
Show during or after reading

14. Emphysema
Show during or after reading
Lung Cancer

15. Show during or after reading

16. Show during or after reading

17. Exit Ticket: Choose one
Summarize what you have learned today
Why do we breathe?
Why is smoking so dangerous for your respiratory system?