1. Respiratory System

2. Respiratory Functions
I.  Provide surface area for the diffusion of gasses
A. Oxygen (To be transported to the cells for aerobic respiration)
B. Excrete carbon dioxide
II. Warm, moisten, and filter inspired air

3. Respiratory Organs Breathing structures Nose (Filters air)
Sinuses (Warm and moisten air)
Pharynx
Trachea
Lungs
a.      Bronchi
b.     Bronchioles
c.      Alveoli

4. Respiratory Organs Accessory structures Diaphragm
Contraction results in inhalation
Relaxation results in exhalation
Vocal cords

9. Healthy Lungs and Smokers Lungs