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Like all living things, we need oxygen to live. Our body gets oxygen when you breathe.




The trachea is the main pipe, that goes from the nose and mouth to your lungs. It is found in the neck .

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The trachea is divided into 2 main tubes, one leading to each lung.

The lungs are the place where the exchange of oxygen and carbon dioxide takes place. of s he t to c an nec are r t b con ere s lle es , th a m pip ide s s e ir Th ur a s. In . yo sac ries air pilla ca

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When you breathe in, air filled with oxygen collects in the air sacs. Carbon dioxide passes back through the capillary walls into the air sacs. When you breathe out, carbon dioxide travels and goes out.

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smooth muscle stretched across the bottom of your lungs When you breathe out, the muscles relax and the lungs shrink.

LET’S REMEMBER! 1. Which are the main organs of the Respiratory System? The nose and mouth, the trachea, the lungs and the diaphragm. 2. How many lungs do we have ? We have two lungs. 3. How does the air enter to our body? The air enters to our body through the nose or the mouth, then it goes to trachea and reaches the lungs. 4. Where does the exchange of oxygen and carbon dioxide occur? In the trachea.

In the lungs.

In the diaphragm.

5. Why is the diaphragm important? Because it makes space in your chest to let the air you breathe in.





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