Compare the effects of stimulating vs blocking of Alpha, Beta and Dopaminergic receptors?
(probably an essay question)
stimulating alpha1 will promote fight/flight (ie constrict arterioles and veins, mydriasis the eyes). when alpha1 is blocked it will inhibit the fight/flight. beta1 is similar to alpha1 in that it prepares for fight/flight (ie increased heartrate, conductivity, automaticity and contractility). blocking beta1 will inhibit the fight/flight. if you inhibit alpha1 and beta1 you will provide an opportunity for the parasympathetic nervous system to prosper. beta2 stimulation is conducive to feed/breed (ie bronchodialtion, arterioles dialation). it allows for a more normal less stressful state. blocking beta3 will allow for the sympathetic nervous system to prosper. dopaminergic stimulation causes vasodilation that will provide conditions for a more normal state since the important organs for fight/flight do not need the increased bloodflow and other parts of the body may reep the benefit.