1. Respiratory system
Lesson 7
February 8th, 2011

2. The respiratory system does its job every time you take a breath.
You Inhale or breath in air, which contains oxygen. The blood delivers the oxygen to all the cells in your body. Without oxygen, your body cells would die.
You exhale or breathe out carbon dioxide. Carbon dioxide is a waste product that your cells make but cannot use.

3. Study the parts of the respiratory system.
The Windpipe is a tube for air at the front of your throat. Colour it yellow
The Lungs are your breathing organs. Colour them red.

4. How does the respiratory system work?
This is what happens when you breathe.
You inhale air through your nose or mouth
The air flows through the windpipe
The windpipe divides into two tubes that lead to the lungs.
Inside each lung, oxygen passes into the air and carbon dioxide is breathed out.