What is the primary function of the bronchial circulation?

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Regulating the temperature and humidity of inhaled airFacilitating the uptake of medicationsEnabling the exchange of gasesMaintaining additional lung volume

Explanation

The bronchial circulation is mainly responsible for supplying oxygenated blood to the lung tissues themselves, but it does not participate in the exchange of gases between air and blood; that role belongs to the pulmonary circulation. Therefore, gaseous exchange is not a function of bronchial circulation.