You can't see your lungs, but it is easy to feel their
action. Put your hand on your chest and take a deep
breath. You will feel your chest enlarge as you breathe
in. Then, your chest will return to normal as you breathe
out. You have just felt the power of your lungs.
Lungs are the main organ of our respiratory system. These powerful lungs are the organs
that provide our cells with
oxygen. They also allow carbon dioxide to leave our
body. Healthy lungs are pink and feel squishy. The
pink is the lung tissue. The squishy feeling comes from millions of tiny air sacs. These air sacs
are called alveoli. Each lung has about 300 million alveoli.
Alveoli send oxygen into the blood. They also take
waste (carbon dioxide) out of the blood. Our powerful lungs
help keep our cells alive and healthy.
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