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Receptors (Adrenergic (Alpha 1 (Stimulates vasoconstriction (Skeletal…
Receptors
Adrenergic
Alpha 1
Stimulates vasoconstriction
Skeletal muscles, viscera, and skin
Stimulates smooth muscle contraction
Eye and intestines
Secretion of glucose (glycogenolysis)
Postganglionic
Beta 1
Increases heart rate and ability to contract (Excitatory)
Inhibitory
Postganglionic
Beta 2
Increase in vasodilation of bronchioles and arterioles
Secretion of glucose (glycogenolysis)
Inhibitory
Postganglionic
Catecholamines (Norepinephrine and Epinephrine)
Postganglionic
Receptors here are located in the sympathetic nervous system
Alpha 2
Decreases release of norepinephrine
Decreased activation of sympathoadrenal system
Excitatory
Preganglionic
Cholinergic
Nicotinic
Preganglionic
Targets CNS and skeletal muscles
Depolarization (Na+ in)
Excitatory
Muscarinic
Postganglionic
Targets the visceral organs
Hyperpolarization (K+ out)
Excitatory and inhibitory
Acetylcholine (ACh)
Preganglionic
Receptors here are located in the parasympathetic nervous system