Each of the following is a neurotransmitter except _____________?
Correct answer: D. insulin
- A. serotonin
- B. endorphins
- C. dopamine
- D. insulin
Explanation
Insulin is primarily a hormone that regulates blood glucose, not a neurotransmitter used for rapid neuron-to-neuron signalling. Serotonin, dopamine, and endorphins can function as chemical messengers in the nervous system.
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