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.
agonist - (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction. drug-a substance that is used as a medicine or narcotic.biochemistry-the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry.gonist - (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction. drug-a substance that is used as a medicine or narcotic.