Question

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what is norepinephrine?

a protein found in red blood cells.

another important neurotransmitter involved in the autonomic nervous system.

a neurotransmitter that is only found in the peripheral nervous system.

a type of white blood cell.

a hormone produced by the thyroid gland.

Explanation:

Norepinephrine is an important neurotransmitter in the autonomic nervous system. It is not a protein in red - blood cells, nor is it only in the peripheral nervous system. It's not a white - blood cell type or a thyroid - produced hormone.

Answer:

Another important neurotransmitter involved in the autonomic nervous system.