#agonist

• Adverse — Situated in direct opposition, contrary, antagonistic; manifesting an attitude of confrontation, rivalry, or open hostility towards a person, idea, or cause. In legal or competitive contexts, the term designates the side standing on a diametrically opposed position within a litigation or dispute, representing the resisting force.
• Agonist — A chemical substance, drug, or hormone that binds to a specific cellular receptor and triggers a biological response, mimicking the action of an endogenous compound; in muscle physiology, it designates a muscle whose contraction directly produces a specific movement.
• Agonist — The feminine form of the term agonist; designates a substance, molecule, or drug capable of activating a cellular receptor, or an adjectival reference to a prime mover muscle action initiating a physical movement.
• Agonistic — Relating to competition, struggle, or ritualized conflict; in ethology and behavioral psychology, it describes a suite of social interactions (including aggression, threat, submission, or retreat) displayed between members of the same species.
• Agonistic — The feminine form of the term agonistic; designates a conflictual stance, attitude, or competitive display, or historically as a noun, the art and theory of public contests and athletic struggles in ancient Greece.
• Anagon — A rare biochemical term or structural variant designating a substance, chemical compound, or agent that blocks, inhibits, or neutralizes the action of a hormone, enzyme, or agonist; a biological antagonist. In a precise molecular sense, it refers to molecules designed or existing in nature that compete for the same cellular receptors, halting the triggering of the cell's normal physiological response.
• Antagonistic — Being in irreconcilable opposition, glaring contradiction, or direct conflict with another element, concept, or force; exerting an opposite, neutralizing, or destructive action upon a system. In physiology and pharmacology, the term qualifies muscles or substances acting structurally in opposite directions (such as flexor versus extensor muscles or a drug blocking a hormone's receptors), generating a stable functional contrast.
• Antagonist — Being in antagonism or manifesting an active and constant opposition to someone or something else. In literature and cinema, it represents the character, force, or structural element that opposes the protagonist, generating the main conflict. In anatomy and physiology, it describes a muscle that executes a movement contrary to the movement performed by another muscle (agonist).
• Antagonistic — Manifesting, containing, or characterized by antagonism; deeply hostile, incompatible, and in a permanent state of structural or functional opposition. It applies to relationships, behaviors, or forces whose components actively work against each other, preventing harmony and generating latent or overt conflict.
• Antihormone — A natural or synthetic substance capable of inhibiting or completely neutralizing the biological action of a specific hormone in the organism. In a structural sense, it acts as a competitive antagonist, blocking cellular hormone receptors or directly disrupting the synthesis, secretion, or transport of the respective hormone in the bloodstream.
• Antinicotinic — A property of a chemical substance or medication to inhibit, block, or neutralize the physiological, neurological, and toxicological effects of nicotine in the body; a pharmacological antagonist that acts specifically on nicotinic acetylcholine receptors (nAChR), used clinically in smoking cessation therapies or as a neuromuscular blocking agent.
• Anti-sulfonamide — A chemical substance or biological compound capable of blocking, neutralizing, or inhibiting the antibacterial therapeutic effect of sulfonamides. In a biochemical sense, it most often acts as a competitive antagonist (such as para-aminobenzoic acid), restoring normal folic acid synthesis in bacterial cells and thereby nullifying the drug's bacteriostatic action.
• Antivitamin — A chemical substance or organic compound with a molecular structure similar to a vitamin, capable of blocking, competing with, or completely nullifying its specific biological and metabolic effects. Antivitamins most frequently act through competitive inhibition, occupying the active site of an enzyme or preventing normal intestinal absorption, being utilized experimentally in the laboratory or in therapy (such as methotrexate, an antifolate antivitamin used as a cytostatic).
• Apomorphine — A medicinal substance chemically derived from morphine via dehydration, yet devoid of analgesic or narcotic properties, acting as a potent and non-selective dopamine receptor agonist; a fast-acting emetic. In contemporary medical practice, it is utilized as an injection or infusion for treating acute immobility episodes ('off' periods) in advanced Parkinson's disease patients.
• Atropine — A toxic alkaloid extracted from deadly nightshade (Atropa belladonna) and other plants of the Solanaceae family, used in medicine as a parasympatholytic agent; it acts structurally by blocking acetylcholine muscarinic receptors, causing effects such as pupil dilation (mydriasis), reduction of glandular secretions, and acceleration of the heart rate. It represents an essential antidote in poisonings with organophosphorus pesticides or nerve gases.
• Autodiegetic — Designating a type of narrator who is at the same time the protagonist, the main character of the narrative text; relating to first-person narrative where the storyteller recounts their own experiences lived within the fictional universe.