Which of the following is true of the neurotransmitter serotonin?

A) It is related to the personality trait of extraversion.
B) It inhibits the firing of neurons in the central nervous system.
C) It is involved in the regulation of mood and attention.
D) It is hardly involved in the regulation of sleep.

Question

Jiyuan Huang · Accepted Answer

Final Answer : C, Explanation :  Serotonin is involved in the regulation of mood and attention, and is often implicated in depression and anxiety disorders. It does not inhibit the firing of neurons, but rather enhances it. Additionally, serotonin is heavily involved in the regulation of sleep, as it is a precursor to the hormone melatonin that is involved in the sleep-wake cycle. Some research suggests that serotonin may also be related to the personality trait of extraversion, but this is not its primary function.

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