Antagonist

A tooth in one jaw that articulates with a tooth in the opposing jaw, also called dental antagonist.


A substance that tends to nullify the actions of another, such as a drug that binds to cell receptors without eliciting a biologic response.


A muscle whose action is the direct opposite of another muscle.


A substance that acts against and blocks an action.


The muscle in a muscle pair that is relaxed or stretched when the other muscle is contracting.


In pharmacology, a substance that opposes, blocks, or Neutralizes a receptor-mediated biological response. For example, the morphine antagonist naloxone competes with morphine for receptor Sites in the brain and other tissues. By occupying these sites, Naloxone prevents the narcotic agent from binding to the receptors and exerting its effect. Contrast with agonist.


A drug that reduces or blocks the action of another drug. For example, naloxone blocks the action of morphine by competing with it for receptor sites in the brain and other tissues. By occupying these sites, naloxone prevents the narcotic from binding to the receptors and exerting its effect. Contrast with agonist.


A muscle that acts in opposition to the action produced by a prime mover.


Inhibitor at membrane receptors; blocks the activity of an endogenous ligand.


Molecules that bind to certain proteins (e.g., receptors, enzymes) at a specific (active) site on that protein. The binding suppresses or inhibits the activity (function) of that protein.


A substance that exerts a nullifying or opposing action on another substance.


In pharmacology, a substance that opposes, blocks, or neutralizes a receptor-mediated biological response. For example, the morphine antagonist naloxone competes with morphine for receptor sites in the brain and other tissues. By occupying these sites, naloxone prevents the narcotic agent from binding to the receptors and exerting its effect. Contrast with agonist.


Referring to a muscle which opposes another muscle in a movement.


Referring to a substance which opposes another substance.


A compound that interferes with the action of another compound.


A drug that binds to a receptor but does not cause a change in cell activity.


A drug that binds to a cell receptor without eliciting a biological response. Antagonist drugs are substances that tend to cancel out the action of active substances.


A muscle whose action (contraction) opposes that of another muscle (called the agonist or prime mover). Antagonists relax to allow the agonists to effect movement.


A muscle the contraction of which opposes that of another muscle called the agonist. When the agonist contracts, the antagonist relaxes.


Something that blocks, undoes, or produces the opposite effect of an action.


A muscle opposing a movement. For example, in a biceps curl, the triceps muscle is the antagonist.


Muscle working in opposition to the agonist. When the agonist contracts, the antagonist relaxes.


A pharmaceutical medication that impedes the functioning of a specific substance, such as an opiate, by attaching itself to the corresponding receptor and inhibiting its actions.


Antacids, when taken regularly without appropriate medical supervision, may exhibit an antagonistic impact. In simpler terms, these medications work against the natural chemicals present in the body, counteracting their effects.


Something that operates in an opposing manner to counteract another substance or effect. For instance, a drug that counteracts the effects of another drug is referred to as an antagonist. This term is also used to describe nerves and muscles that work in opposition to one another. For example, muscles responsible for bending a limb at a joint are considered antagonists to those responsible for straightening it, and vice versa.


A substance that acts as a blocker at membrane receptors, inhibiting the activity of a natural ligand.


 


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