1.2 The respiratory system
Parts of the respiratory system
The human respiratory system contains:
Two lungs
Air tubes
Muscle in the chest
The lungs and breathing
The lungs are like stretchy sponges that fill up with air.
The air tube that carries the air we breathe in down to the lung in the windpipe.
When we breathe in, oxygen moves in to the blood vessel in the lungs.
 as your bodies uses up oxygen, it makes carbon dioxide.
The blood carries the carbon dioxide back to the lungs.
We get rid of carbon dioxide in the air we breathe out.
The number of times we breathe in and out in one minute is called breathing
rate.
Homework
i. Define the following terms
1. Windpipe (trachea)
2. Breathing rate
ii. Fill in the blanks
3. Our bodies produces a waste gas that we must rid of called ________________.
4. When we breathe in your chest gets ___________. (bigger/smaller)
5. The a cycle diagram of respiratory system.
Continued
Breathing involves two different stages:
1. Breathing in and
2. Breathing out.
The muscle in the chest that helps us to breathe in and out is called
diaphragm.
The diaphragm muscle contracts to make the chest expand so there is
ore space for lungs to fill up with air.
Exercise make us breathe faster.
Classwork
Answer the following according to the given questions
1. The lungs are hollow sacs, like balloons. (TRUE/FALSE)
2. The diaphragm contracts to make us breathe faster. (TRUE/FALSE)
3. Do you breathe all the time? why or why not?