Give Meanings for the Following Prefixes

question 189

Short Answer

Give meanings for the following prefixes.
-contra-: __________

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Definitions:

Raphe Nuclei

A group of nuclei found in the brain stem involved in the regulation of sleep and mood, among other functions.

Neurotransmitters

Neurotransmitters are chemical messengers that transmit signals across a chemical synapse, from one neuron to another target neuron, muscle cell, or gland cell.

Serotonin

A neurotransmitter in the brain involved in regulating mood, appetite, and sleep among other functions.

Acetylcholine

A neurotransmitter involved in many functions including muscle movement, heart rate, memory, and also acts as a neuromodulator in the central and peripheral nervous systems.