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bronchiole

bron·chi·ole

/ˈbräNGkēˌōl/

Noun

The bronchi continue to divide again and again into numerous bronchioles. Each of these bronchioles can expand or constrict depending upon the needs of the body for air exchange as well as reacting to certain substances. For example, pollen can cause the bronchioles to abnormally constrict in a patient with asthma, making it very difficult to breathe.