![]() ![]() Parkinson's disease, which is a degenerative disease that results in tremors and motor movement impairments, is caused by the loss of dopamine-generating neurons in the brain. This chemical messenger also plays an important role in the coordination of body movements. Several types of addictive drugs increase dopamine levels in the brain. Dopamine: Commonly known as the feel-good neurotransmitter, dopamine is involved in reward, motivation, and additions.It plays a role in allergic reactions and is produced as part of the immune system's response to pathogens. Histamine: This organic compound acts as a neurotransmitter in the brain and spinal cord. ![]() Levels of this neurotransmitter are typically lowest during sleep and highest during times of stress. Its role is to help mobilize the body and brain to take action in times of danger or stress. Norepinephrine: This naturally occurring chemical is a neurotransmitter that plays an important role in alertness and is involved in the body's fight-or-flight response. ![]() However, it functions as a neurotransmitter in the brain. ![]() Generally, epinephrine is a stress hormone that is released by the adrenal system.
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