Antagonism (other)
Antagonism may refer to: *The characteristic of an antagonist *Antagonism (chemistry), where the involvement of multiple agents reduces their overall effect * Drug antagonism, a drug that stops the action or effect of another substance, preventing a biological response ** Receptor antagonism or pharmacological antagonism, the action of a drug that inhibits the function of an agonist at the level of a receptor *Antagonism (phytopathology), an effect that suppresses the activity of a plant pathogen *Reflexive antagonism of muscles * Intraspecific antagonism, disharmonious or antagonistic interaction between two individuals of the same species See also *Antagonist (other) An antagonist is a character opposing the protagonist in literature. Antagonist may also refer to: Science and medicine * Antagonist (muscle), a muscle type * Receptor antagonist, a class of drugs that bind to but do not trigger a receptor * Phys ...

Antagonist
An antagonist is a character in a story who is presented as the main enemy or rival of the protagonist and is often depicted as a villain.About.com, Literature: Contemporary "Antagonist." Online. 18 October 2007.
* Retrieved 25 March 2015. * Retrieved on 27 March 2015. * Retrieved on 27 March 2015. * Retrieved on 27 March 2015.

Etymology

The English word antagonist comes from the Greek ἀνταγωνιστής – ''antagonistēs'', "opponent, competitor, villain, enemy, rival," which is derived from ''anti-'' ("against") and ''agonizesthai'' ("to contend for a prize").

Types

Heroes and villains

The ...
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Antagonism (chemistry)
Chemical antagonists impede the normal function of a system. They function to invert the effects of other molecules. The effects of antagonists can be seen after they have encountered an agonist, and as a result, the effects of the agonist is neutralized. Antagonists such as dopamine antagonist slow down movement in lab rats. Although they hinder the joining of enzymes to substrates, Antagonists can be beneficial. For example, not only do angiotensin receptor blockers, and angiotensin-converting enzyme (ACE) inhibitors work to lower blood pressure, but they also counter the effects of renal disease in diabetic and non-diabetic patients. Chelating agents, such as edetate calcium disodium, fall into the category of antagonists and operate to minimize the lethal effects of heavy metals such as mercury or lead. In chemistry, antagonism is a phenomenon wherein two or more agents in combination have an overall effect that is less than the sum of their individual effects. The word i ...
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Drug Antagonism
Drug antagonism refers to a medicine stopping the action or effect of another substance, preventing a biological response. The stopping actions are carried out by four major mechanisms, namely chemical, Pharmacokinetics, pharmacokinetic, Receptor antagonist, receptor and physiological Antagonism (chemistry), antagonism. The four mechanisms are widely used in reducing overstimulated physiological actions. Drug antagonists can be used in a variety of medications, including anticholinergics, antihistamines, etc. The antagonistic effect can be quantified by pharmacodynamics. Some can even serve as antidotes for toxicities and overdose. Receptor Antagonism Mechanism of Action Receptor (biochemistry), Receptors bind with endogenous ligands to produce a physiological effect and regulate the body and cellular homeostasis. In a ligand-receptor interaction, the ligand binds with the receptors to form a drug-receptor complex, producing a biological response.Receptor Theory. In: Stringer ...
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