electrical stimulation of the cervical sympathetic trunk or administration of epinephrine or norepinephrine increases the permeability of the gland enabling glucose ( molecular radius , mr = 3.5 a ) , sucrose ( mr = 4.4 a ) , raffinose ( mr = 5.6 a ) , polyglycol 1000 ( mr = 7.2 a ) , and polyglycol 1540 ( mr = 8.1 a ) to penetrate into the saliva from which they are otherwise excluded .
C0014563
epinephrine
C0028351
norepinephrine