hormone,
internal secretion,
endocrine the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect
catecholamine any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland
neurotransmitter a neurochemical that transmits nerve impulses across a synapse
pressor,
vasoconstrictive,
vasoconstrictor any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure
