1. The Respiratory System

2. The system of the body that deals with breathing
The body takes in the oxygen that it needs and removes the carbon dioxide that it doesn’t

3. The Oxygen Delivery System
Main function - to supply the blood with oxygen
Does this through breathing

4. Breathing and Respiration are NOT the same thing!

5. Moving air in and out of the lungs
Breathing
Moving air in and out of the lungs

6. Chemical reaction that releases energy
Respiration
Chemical reaction that releases energy

7. Inhalation Breathing in Body gets oxygen from the air
Rib muscles contract to pull ribs up and out
Diaphragm muscle contracts to pull down the lungs
Tissue expands to force (pull) in air.

8. Exhalation Breathing out Get rid of carbon dioxide Rib muscles relax
Diaphragm muscle relaxes
Tissue returns to resting position and forces (pushes) air out

9. Parts of the System Mouth Nose Trachea Lungs Diaphragm
splits into bronchi
bronchioles
Lungs
Bronchioles
Alveoli
Diaphragm

13. Lungs Bronchial tubes Many smaller tubes
Alveoli (alveolus) – surrounded by capillaries
Average adult's lungs contain about 600 million of these air-filled sacs

15. Pathway of Oxygen
Body breathes in the air which is pulled through the nose or mouth and down through the trachea

17. Pathway of Oxygen The trachea is a pipe shaped by rings of cartilage.
It divides into two tubes called bronchi.
Bronchi carry air into each lung.

18. Pathway of Oxygen
Inside the lung, the tubes divide into smaller and smaller tubes called bronchioles.
At the end of each of these tubes are small air sacs called alveoli.
Capillaries, which are small blood vessels with thin walls, are wrapped around these alveoli.

20. Pathway of Oxygen
Capillary walls are so thin and close to each other that the air easily diffuses through.

22. Pathway of Oxygen
Oxygen diffuses through the capillaries into the bloodstream.
Carbon dioxide in the bloodstream, diffuses through into the alveoli, and is then removed from the body when we breathe out.

25. The Diaphragm
The muscle that controls the breathing process.

26. The Diaphragm
The diaphragm flattens to cause the chest to expand and air is pulled into the lungs.

27. The Diaphragm
When the diaphragm relaxes, the chest collapses and the air in the lungs is forced out.