drugs that stimulate and mimic the actions of the sympathetic nervous system; also called sympathomimetics
receptor sites for the sympathetic neurotransmitters norepinephrine and epinephrine
a class of adrenergic receptors that are further subdivided into alpha1- and alpha2-adrenergic receptors, and are differentiated by their anatomic location in the tissues, muscles, and organs regulated by specicific autonomic nerve fibers
bodily functions that are involuntary and result from the physiologic activity of the ANS. the functions often occur in pairs of opposing actions b/w the sympathetic and parasympathetic divisions of the ANS.
Autonomic Nervous System
a branch of the PNS that controls autonomic bodily functions; it ocnsists of the sympathetic nervous system and the parasympathetic nervous system
receptors located on postsynaptic effector cells of tissues, muscles, & organs stimulated by specific autonomic nerve fibers.
substances that can produce a sympathomimetic response. they are either endogenous catecholamines or synthetic catecholamine drugs
a 3rd type of adrenergic receptor located in various tissues and organds and activated by the binding of the neurotransmitter dopamine, which can either be endogenous or a synthetic drug form
Positive dromotropic effect
an increase in the conduction of cardiac electrical impulses thru the AV node, which results in the transfer of nerve action potentials from the atria to the ventricles. this ultimately leads to a systolic heartbeat
drugs used therapeutically that mimic the catecholamines epinephrine, noeepinephrine, and dopamine; also called adrenergic agonists