Sympathetic input in bronchioles leads to bronchodilation, reducing airway resistance and promoting relaxation, except for causing a bigger lumen.
Sympathetic input to the smooth muscle tissue in bronchioles causes all of the following except:
In this context, sympathetic input leads to bronchodilation, which results in a bigger lumen, reducing airway resistance and promoting relaxation. The activation of beta-two receptors is also associated with smooth muscle relaxation in the bronchi. Therefore, the correct answer to the question is the option mentioning a bigger lumen.
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