agonist

An agonist is a molecule that interacts with a CELL RECEPTOR and triggers RECEPTOR ACTIVATION, initiating a SIGNAL TRANSDUCTION pathway that results in a physiological or pharmacological effect. Agonists may include naturally occurring HORMONES, NEUROTRANSMITTERS, or synthetic DRUGS designed to mimic endogenous signaling molecules. Depending on their activity, agonists may be classified as FULL AGONISTS, which produce maximal receptor activation, PARTIAL AGONISTS, which produce a reduced response, or INVERSE AGONISTS, which decrease baseline receptor activity. The action of an agonist differs from an ANTAGONIST, which blocks receptor activation and prevents a biological response.

An agonist is a substance that attaches to a cell receptor and turns it on, causing a specific effect in the body.

• An agonist is a substance that activates a receptor. • It can be a natural body chemical or a medicine. • Agonists work by binding to specific receptors on or inside cells. • They produce a biological effect by activating cell signaling. • Examples include many hormones, neurotransmitters, and drugs. • Types of agonists include: - Full agonist: produces maximum receptor response. - Partial agonist: produces a weaker response. - Inverse agonist: produces an opposite effect by reducing receptor activity. • Agonists have the opposite action of antagonists, which block receptors.