3. Epinephrine (adrenaline, the chemical secreted when you get a surge of excitement or nervousness for example) binds adrenergic receptors. If Epinephrine binds the alpha adrenergic receptor blood vessels constrict. If epinephrine binds a beta-2 adrenergic receptor, blood vessels dilate. What determined the cellular response; epinephrine or the adrenergic receptor?
Group of answer choices
epinephrine
adrenergic receptor