1. Respiratory System
Function---remove particles from the air, transports Oxygen to the air sacs and removes Carbon Dioxide

2. Introduction Video
Video

3. Nose, Nasal Cavity, Paranasal Sinuses and Pharynx
* Nose- Exterior portion only, made of bone and cartilage * Nostrils---openings for air * Nasal Cavity- has mucous membrane w/ psuedostratified ciliated epithelium & blood vessels that warm incoming air & traps dust & other small particles.

4. More Anatomy…
 * Paranasal Siunuses-- air filled spaces w/in bones of skull & nasal cavity,… reduce weight of skull & are resonant chambers for the quality of voice.
* Pharynx- behind nasal/ oral cavities and larynx, common passage way for air and food

5. Larynx, Trachea Larynx- muscles, cartilage & mucous
membrane, prevents foreign objects from
entering the trachea
-has vocal cords which vibrate &
produce sounds as air passes by
-Epiglottis- prevents food/ liquids from entering trachea. 
Trachea-- anterior to esophagus, divides into right & left bronchi
* 20 C-shaped cartilage rings on it—prevents trachea from collapsing & blocking airway

6. Bronchial Tree
Branched air passages that lead from trachea to air sacs
Right and Left Primary Bronchi secondary bronchi tertiary bronchi bronchioles  terminal bronchioles alveolar ducts  thin- walled alveolar sacs
Aveoli- at distal ends of the narrowest tubes… alveolar ducts… This is where gases are exchanged by DIFFUSION!

9. LUNGS– soft, spongy, cone shaped
Enclosed by diaphragm & thoracic cage
Visceral pleura attaches to the surface of the lungs
Parietal pleura lines the thoracic cavity– has fluid that lubricates and decreases friction
Each lung has millions of alveoli
& blood vessels
Right lung is larger---3 lobes
Left – 2 lobes 

10. Diaphragm/ Yawning
sheet-like skeletal muscle and connective tissue that separates the thoracic and abdominal cavities, assists in respiration