Respiratory System 2
Текст на Статията
- At the bottom of the windpipe there are two large tubes,these tubes are called the main stem bronchi.
- One of these tubes leads to the left lung, while the other leads to the right.
- Each main stem branches off into tubes called bronchi, these get smaller and smaller like branches on a tree.
- The tiniest tubes are called bronchioles and there is about 30,000 of them in each lung.
- At the end of each bronchiole is a special area that leads into clumps of tiny air sacks called alveoli.
- There are about 600 million alveoli in your lungs and if you stretched them out, they could cover an entire tennis court!!!
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