When these receptors are stimulated, they increase the diameter of the bronchioles to let more air in and out during breathing and they dilate the vessels of the skeletal muscles so they can receive the increased blood flow produced by stimulating the alpha and beta 1 receptors. When we administer epinephrine or adrenaline to a patient, we expect alpha, beta-1 and beta-2 agonist effects we expect an: So reflect for a moment: If norepinephrine or epinephrine is the neurotransmitter of the sympathetic nervous system and it interacts with all the receptors we just described, then we know that norepinephrine or epinephrine stimulates the alpha, beta-1 and beta-2 receptors and thus it is an alpha agonist, a beta-1 agonist and a beta-2 agonist.
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