Which of the following statements about adrenergic receptors is true? A)They are proteins in the plasma membrane. B)When activated,cAMP levels are affected. C)Epinephrine activates both alpha and beta types. D)Norepinephrine activates mainly the alpha type. E)All of the answers are correct.

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All of the statements about adrenergic receptors are true. Adrenergic receptors are proteins in the plasma membrane that when activated can affect cAMP levels. Epinephrine activates both alpha and beta types, and norepinephrine activates mainly the alpha type.

Which of the Following Statements About Adrenergic Receptors Is true