What happened to the air breathing in once it reaches the lungs
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The air travels down your windpipe and into your lungs.After passing through your bronchial tubes, the air finallyreaches and enters the alveoli (air sacs). Through the very thin walls of the alveoli, oxygen from the airpasses to the surrounding capillaries (blood vessels).
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Answer:In the lungs, each bronchus branches out into smaller tubes called bronchioles. At the end of these tubes are tiny air sacs called alveoli (singular: alveolus). Each lung contains about 300 million alveoli. The air we breathe in eventually reaches these air sacs. The sacs are surrounded by blood vessels. The oxygen present in the air we breathe in, goes into the blood contained in blood vessels. The carbon dioxide present in the blood ( as a waste product of respiration) passes out of the blood into the air sacs. Thus, exchange of gases takes place in the lungs.
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