blood hormone amount blood epinephrine amount The proportion, quantity, or volume in whole blood, serum, or plasma of this catecholamine hormone that stimulates the adrenergic receptors and that causes systemic vasoconstriction and gastrointestinal relaxation, stimulates the heart, and dilates bronchi and cerebral vessels. VT:0005660 blood adrenaline amount CMO:0002375 blood epinephrine level Trait.ontology circulating adreniline concentration CMO:0001008 circulating adrenaline level