NEUROTRANSMITTERS

Dopamine is a neurotransmitter formed in the brain by a decabpxylation of dopa and is essential to the nomal functioning of the Central Nervous System .

Serotonin is a hormone in the pineal gland, blood platelets, the digestive tract, and the brain. It acts both as a a chemical messenger that transmits nerve signals between nerve cells and that causes blood vessels to narrow.

Acetylcholine is a white crystalline derivative choline that is released at the ends of nerve fibers in the somatic and parasystematic nervous systems and is involved in transmission of nerve impulses tot he body.

Endorphins are proteins similar to opioids produced by the endoceine system that give a sense of well being when released into the body.

Agonists is a term used ot describe a type of ligand or drug that binds and laters the activity of the receptor.

Antagonist is a type of ligand or drug that does not provoke a biological response itself upon binding a receptor.

 
NEUROTRANSMITTERS

Afferent neuron- carry inforamtion from the body to the brain.


Interneurons- Works int he brain. Works among the center of the brain.

Efferent- carry information from the brain to the body. 

Every neurotransmitter has a specific purpose.

Once the neurotransmitters leave the axon there is a chemical change inside the neuron.
 

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http://www.answers.com/topic/dopamine