1. Function: Gas Exchange
Respiratory System
Function: Gas Exchange
Bringing oxygen into the body
Getting rid of carbon dioxide

2. Nostrils & Pharynx Air enters nose or mouth
Nostrils trap and filter out dust and foreign particles using tiny hairs and mucus
Air is warmed up and moistened
Air passes through pharynx

3. Trachea Air moves into trachea Also known as the windpipe, contains:
A flap-like structure called the epiglottis
When swallowing food, it prevents it from passing into trachea
The larynx (also known as the voice box)

4. Bronchi Singular form: Bronchus
Two air passages that move inhaled air from the trachea to the right or left lung
Bronchi are divided into bronchioles.
Cilia (tiny hairs) line the inside of the trachea, bronchi and bronchioles and are coated with mucus = prevents bacteria, dust and pollen from entering further down the lungs. Cilia sweeps it upwards to mouth (cough reflex).

5. Lungs Air moves from bronchi into:
Bronchioles – divided from the bronchus that become smaller until they reach tiny air sacs called alveoli
Alveoli – tiny air sacs where gas exchange occurs
Capillaries (tiny blood vessels) surround alveoli: remove CO2 from blood and absorb O2
Red blood cells pick up O2 to send it to rest of body