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Function of the lungsThe function of the lungs is to transport  oxygen into the bloodstream and to take carbon dioxide out of the  bloodstream.trust me, my crappy college prâ¦ofessor told me so. he is  a poohead.
Lung function tests, also called pulmonary (PULL-mun-ary) function tests, measure how well your lungs work. These tests are used to look for the cause of breathing problems, such as shortness of breath. Lung function tests measure: 1  How much air you can take into your lungs.2  How much air you can blow out of your lungs and how fast you can do it. 3  How well your lungs deliver oxygen to your blood. 4  The strength of your breathing muscles.ung function tests measure: 1  How much air you can take into your lungs. 2  How much air you can blow out of your lungs and how fast you can do it. 3  How well your lungs deliver oxygen to your blood. 4  The strength of your breathing muscles.