Which of these is not a neurotransmitter?

Acetylcholine

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GABA

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Norepinephrine

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Thyroxine

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Solution

The correct option is D Thyroxine
Thyroxine is secreted from the follicular cells of thyroid gland. It regulates metabolic rate of body by increasing the consumption of oxygen by metabolically active tissues. Acetylcholine, GABA (Gamma-Aminobutyric Acid) and norepinephrine are neurotransmitters which transmit signals or nerve impulses across the neuromuscular junction. and thus, regulates many functions of body.
So, the correct answer is 'Thyroxine'.

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