Complex organisms have a difficult time exchanging substances. The lungs play a vital role in the exchange of gases in humans and other animals.

What does the lung do?

Your cells require oxygen for respiration, so you need to get it from the air into your bloodstream. You must also expel carbon dioxide from your bloodstream. This exchange of gases takes place inside your lungs. Breathing forces air into and out of your lungs.

The Respiratory System: Lungs
The Respiratory System: Lungs

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