1. Respiratory System http://youtu.be/HiT621PrrO0

2. TO EXCHANGE OXYGEN AND CARBON DIOXIDE BETWEEN THE BLOOD, THE AIR AND TISSUES. Function of the Respiratory System

3. The Flow of Air Nose or mouth Pharynx Larynx Trachea - windpipe Lungs  Bronchi  Bronchioles  Alveoli

4. Nose Air enters the body through the nose or mouth. The nose has mucus and cilia to help filter and clean the air before it goes to the tube at the back of the mouth, the pharynx or throat.

5. Pharynx The pharynx is the passage way for both air and food. It branches into two tubes. One is the esophagus and leads food to the stomach. The other leads to the larynx. Air moves from the pharynx, through the larynx into the trachea (windpipe).

6. Epiglottis The epiglottis is a flap that covers the larynx and trachea (airway) so food does not enter the lungs. It covers (closes) when you swallow.

7. Larynx The larynx (voice box) is at the top of the trachea. It has two highly elastic fold of tissue known as the vocal cords. When muscles pull the vocal cords together, the air moving between them causes the cords to vibrate and produce sound.

8. Trachea Windpipe or airway mucous membrane lining with cilia smooth muscle with c- shaped cartilage rings divides into two branches: bronchi no gaseous exchange

9. Bronchi Bronchus, singular c-shaped cartilage rings with smooth muscle Each bronchus leads into one of the lungs Within the lungs the bronchus then subdivide into smaller passageways called bronchioles The bronchioles end in air sacs called alveoli

10. Bronchioles The bronchioles are the many branches off of the bronchi. The bronchioles end in air sacs called alveoli.

11. Lungs Sponge-like tissues that contain the bronchioles and alveoli.

12. Alveoli air sacs surrounded by capillaries gaseous exchange takes place here

13. Diaphragm http://hes.ucfsd.org/gclaypo/repiratorysys.html#Diaphragm Breathing starts with a dome-shaped muscle at the bottom of the lungs called the diaphragm (DY-uh-fram). When you breathe in, the diaphragm contracts. When it contracts it flattens out and pulls downward. This movement enlarges the space that the lungs are in. This larger space pulls air into the lungs. When you breathe out, the diaphragm expands reducing the amount of space for the lungs and forcing air out. The diaphragm is the main muscle used in breathing.

14. How do we know when to breathe? When CO 2 levels in our blood are too high, the brainstem signals rib muscles & the diaphragm to contract and pull open space in the chest so that lungs will inflate.