Final answer:
The constriction of the bronchioles is not an example of sympathetic stimulation because the sympathetic nervous system typically causes bronchioles to dilate, not constrict.
Step-by-step explanation:
The question pertains to the sympathetic nervous system and its stimulation effects. Among the provided options, the constriction of the bronchioles (a) is not an example of sympathetic stimulation, as sympathetic activity typically leads to dilation of bronchioles to allow more airflow in response to ‘fight or flight’ situations. The other options, including decreased secretion of the pancreas (b), constriction of the urinary sphincter (c), and dilation of skeletal muscle blood vessels (d), are all examples of sympathetic stimulation responses.