Likely he will be diagnosed by the hospital as seen as a risk constantly for violence with others. This isn't uncommon in people with drug abuse, or someone who has come from an abusive household. It's quite likely he has faced abuse and may suffer from an emotional mental health disorder. (IE manic depressive disorder, anger issues, or purely a sociopath)
Neurotransmitters can affect postsynaptic cells by causing molecular changes in the cells.
The term "chemical messengers of the body" is frequently used to describe neurotransmitters. The nervous system uses these molecules to send information between neurons or from neurons to muscles. A neurotransmitter influences a neuron in one of three ways: excitatory, inhibitory or modulatory.
When a stimulus is potent enough, the chemical messenger neurotransmitter is transferred into the nerve impulse. If it is powerful enough, it will reach the postsynaptic cell and affect the structure of the neuron. And when signal transduction happens, everything mentioned above is completed.
To know more about neurotransmitters visit the link:
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I think it's label B..I'm not 100% sure though.