Doctors may use a spirometer to measure lung activity to find out about people's lung capacity and how easy it is for them to breathe in and out. This is useful when checking the health of people with diseases of the lungs, such as chronic obstructive pulmonary disease.
Peak flow meters are used to detect the speed with which people can exhale the air from their lungs. This tells doctors how clear the airways are. A spirometer may be used to measure lung volumes and the rate at which oxygen is used.
At rest, air moves in and out of you lungs about 12 times per minute as your diaphragm and intercostal muscles contract and relax. Each breath refreshes some of the air in your lungs and carries away some of the CO2 generated in your body. If you exercise, or are frightened, you breathe more deeply and more quickly. This gets more oxygen-rich air into your lungs and removes more CO2-rich air out of you lungs.
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