since the properties of beta 2-adrenoceptors in human lymphocytes resemble those in other tissues , the hypothesis is presented that the increased density of beta 2-adrenoceptors may reflect sympathetic hyperactivity in essential hypertension , which might contribute ( perhaps via enhanced release of endogenous noradrenaline through stimulation of presynaptic beta 2-adrenoceptors by adrenaline ) to the elevation of blood pressure .
C0028351
noradrenaline
C0014563
adrenaline