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One who contends with another, especially in combat; an adversary; an opponent.
A muscle which acts in opposition to another; as a flexor, which bends a part, is the antagonist of an extensor, which extends it.
A medicine which opposes the action of another medicine or of a poison when absorbed into the blood or tissues.
Antagonistic; opposing; counteracting; as, antagonist schools of philosophy. a drug that neutralizes or counteracts the effects of another drug a muscle that relaxes while another contracts; 'when bending the elbow the triceps are the antagonist'.
someone who offers opposition. a muscle that relaxes while another contracts; 'when bending the elbow the triceps are the antagonist'. a drug that neutralizes or counteracts the effects of another drug.
A drug or a compound that opposes the physiological effects of another At the receptor level, it is a chemical entity that opposes the receptor- associated responses normally induced by another bioactive agent [IUPAC Medicinal Chemistry] Compare agonist.
An agent or substance that counteracts the action of another.
Muscle that counteracts the agonist, lengthening when the agonist muscle contracts.
A chemical that binds to a receptor and blocks it, producing no response, and preventing agonists from binding, or attaching, to the receptor Antagonists include caffeine and naloxone.
A drug that prevents or reverses the action of another drug.
A substance that tends to nullify the action of another.
A substance that tends to nullify the action of another; in pharmaceutical terms, a drug that binds to a receptor without eliciting a biological response.
A character whose actions work in direct opposition to the protagonist Examples:.
A compound or drug which blocks or inhibits the effects of a neurotransmitter on receptor activation in the post-synaptic cell.
Opponent of the protagonist in a drama. a neutral term for a character who opposes the leading male or female character See hero/heroine and protagonist Close Window.
A molecule that makes it more difficult for a post-synaptic cell to be influenced by neurotransmitters.
A molecule that prevents the activation of a receptor See Agonist.
One agent that opposes or fights the action of another For example, insulin lowers the level of glucose in the blood, whereas glucagon raises it; therefore, insulin and glucagon are antagonists.
Biological agent that reduces the number or disease-producing activities of a pathogen.
The major character in opposition to the hero or protagonist of a narrative or drama.
Something opposing or resisting the action of another One of two muscles which pull in nearly opposite directions.
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