Question

which of the following is a sympathetic neurotransmitter that causes vasodilation? dopamine norepinephrine nitric oxide acetylcholine serotonin

Explanation:

Dopamine is a neurotransmitter that can cause vasodilation in certain blood vessels when it acts on specific receptors. Norepinephrine typically causes vasoconstriction (narrowing of blood vessels) in most vascular beds. Nitric oxide is a paracrine agent (not a classic sympathetic neurotransmitter in the traditional sense as it is not stored in synaptic vesicles like the others) that causes vasodilation. Acetylcholine can cause vasodilation in some tissues (e.g., endothelial - dependent vasodilation) but it is more commonly associated with the parasympathetic nervous system. Serotonin usually causes vasoconstriction. Among the options given, dopamine is the sympathetic neurotransmitter that can cause vasodilation.

Answer:

dopamine