Human Body

There are many tubes that connect your mouth to the insides of your lungs. Your trachea (or wind pipe) is the big tube you can feel in your throat. This splits into main stem bronchi, which then split many more times into tiny tubes called bronchioles. There are around 30,000 bronchioles in your lungs! At the end of each of these tiny tubes are little sacks called alveoli. These get bigger and smaller with each breath, and contain lots of blood vessels which is where oxygen enters the blood and waste (like carbon dioxide) leaves the blood.

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