1. The Respiratory System

2. Explain the Function of the Respiratory System

3. Explain the Function of the Respiratory System
To supply the blood with oxygen in order for the blood to deliver oxygen to all parts of the body
It is the system of the body that deals with breathing

4. Click here for an interactive diagram of the structures & functions of the respiratory system:

5. What is the pathway oxygen takes through the body?

6. What is the pathway oxygen takes through the body?
Nose & mouth
Pharynx
Trachea
Bronchi
Bronchioles
Alveoli
Capillaries

7. Explain gas exchange in the lungs

8. Explain gas exchange in the lungs
Oxygen in the lungs diffuses through the alveoli, through the capillary wall, and into the blood
Carbon dioxide in the blood diffuses through the capillary wall and into the alveoli

9. Explain gas exchange in the lungs
This animation was taken from:
Click the link to read more about gas exchange

10. What causes breathing?

11. What causes breathing? Inhalation Exhalation
Rib muscles contract to pull ribs up and out
The DIAPHRAGM muscle contracts to pull down the lungs
Tissue expands to pull in air.
Exhalation
Rib muscles relax
The Diaphragm muscle relaxes
Tissue returns to resting position and pushes air out.