Which of the following is NOT a second messenger? A) cGMP B) norepinephrine C) nitric oxide D) diacylglycerol E) Ca²⁺

Name: Which of the following is NOT a second messenger? A) cGMP B) norepinephrine C) nitric oxide D) diacylglycerol E) Ca 2+
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Norepinephrine is a neurotransmitter and not a second messenger. Second messengers are molecules that relay signals from the cell surface to intracellular targets, and examples include cGMP, nitric oxide, diacylglycerol, and Ca²⁺.

Which of the Following Is NOT a Second Messenger