An antagonist is a muscle that counteracts, slows down, or stops the movement of the agonist. It lengthens when the agonist contracts. It assists in joint stabilization and braking the limb at the end of a fast movement. Also see Muscle Roles: What is an Agonist, Antagonist, Stabilizer, Fixator or Neutralizer Muscle?
In physiology and pharmacology, an antagonist is a substance that prevents the stimulation of a cell's receptor by binding to the cell and preventing other substances, therefore, from binding. A narcotic antagonist is a drug used which is able to bind to cells to prevent the action of a narcotic.
This page created 29 Sep 2011 19:43
Last updated 02 Mar 2016 19:51