The cause of fibromyalgia is unknown; however, it is believed to involve a combination of genetic and environmental factors with half the risk attributed to each. The condition runs in families and many genes are believed to be involved.
Agonist: A substance that acts like another substance and therefore stimulates an action. Agonist is the opposite of antagonist. Antagonists and agonists are key players in the chemistry of the human body and in pharmacology.
Agonists and Antagonists. Agonists are chemicals that mimic the action of a particular neurotransmitter. They bind to receptors and generate postsynaptic potentials. Antagonists are chemicals that block the action of a particular neurotransmitter. They bind to receptors but canât produce postsynaptic potentials.Because they occupy the receptor site, they prevent neurotransmitters from acting.eurons, Hormones, and the Brain. 1  The Nervous System. 2  Neurons: Cells of the Nervous System. 3  Neurotransmitters. 4  Studying the Brain. 5  Structure and Functions of the Brain. 6  The Endocrine System. 7  Quick Review. 8  Review Questions. 9  Neurons, Hormones, and the Brain Quiz. 10  How to Cite This SparkNote.