Exercise and skeletal muscle blood flow Q. I thought I understood it...

During exercise "as skeletal muscle arterioles dilate, arterioles to certain other areas help compensate by constricting. The primary organs for this sympathetic vasoconstriction are the gut, skin and inactive skeletal muscles." Cardiovascular Response to Exercise What causes vasoconstriction in inactive skeletal muscles? I understand that local mediators in active skeletal muscles (ie. ADP, K+, NO)... Exercise and skeletal muscle blood flow Q. I thought I understood it...
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