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

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Adrenergic receptors are G protein-coupled receptors (D) that, when activated, can affect cAMP levels (A). Norepinephrine primarily activates alpha receptors (B), while epinephrine can activate both alpha and beta receptors (C).

Which of the Following Statements About Adrenergic Receptors Is true