release of --------- onto skeletal muscle blood vessles result in ...... 1. Acetylcholine, vasoconstriction 2.norepinephrine,vasoconstriction 3.Acetylcholine, vasolidation  4,norepinephrine, vasolifation    1.can you tell me why do we choose sympathetic instead of para symapthetic. make it short and clear. 2.If we say sympathetic why do we choose pregangolic with ACH ? how can I know? 3. explain how is alpha beta thing relate. How do you choose vasoconstriction vs vasolidation?   please teach me a trick. make it short and claer please. I get so confused

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