The Respiratory System

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The lungs are the most known and important part or the respiratory system. That is where the main gas exchange occurs. You need oxygen which you breathe in which is filtered out in your lungs. It then travels through your body in the circulatory system. Then the carbon dioxide gets taken out through the lungs also.


Alveoli are little sacks inside the lungs in which the gas exchange occurs. They look like little grapes. The average human has about 300 of these little sacks. They are all about 1 cell big.