The respiratory system
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- it is the system that allows us to get 1 from the air inhaled in the lungs and to expel 2 through exhalation
- every time we inhale, air enters our nose or our mouth and, passing through the 3 and the 4, it goes down the long 5 tube and inside two small galleries, the 6
- the bronchi lead into the 7 and they divide again into several other galleries which become smaller and smaller
- they are called 8 tubes and in turn they split into many very small tubes which connect to more than 700 tiny sacs of spongy tissue, the 9, whose walls are very thin
- it is here that the 10 oxygen-carbon dioxide between 11 and lungs takes place
- going through the lungs, the blood fills up with 12 to be taken to the heart and it leaves the 13 which is removed from the lungs upon 14
- the respiratory system's primary organs include the 15, nose, pharynx, 16, trachea, 17, lungs
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