When norepinephrine binds to adrenergic receptors, A) Na⁺ channels open. B) Ca²⁺ channels open. C) adrenaline is released. D) G proteins mediate the cell's response. E) Na⁺ channels are closed.

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When norepinephrine binds to adrenergic receptors, G proteins mediate the cell's response. This is a key mechanism in the action of many hormones and neurotransmitters, including norepinephrine, which activates G protein-coupled receptors leading to various cellular responses.

When Norepinephrine Binds to Adrenergic Receptors