A drug that rapidly combines with a receptor to initiate a response and rapidly dissociates or releases from the receptor is called a (an)
a. agonist.
b. antagonist.
c. receptor.
d. ligand.
a. Agonist is a drug that rapidly combines with a receptor to initiate a response and rapidly dissociates or releases from the receptor. It has a high efficacy. Most drugs used today are agonists. An antagonist is a drug that binds to the receptor but does not dissociate and has no positive response and no efficacy. A ligand is a molecule or drug that binds to a receptor to form a larger complex.
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Indicate whether the statement is true or false
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The first letter of the pacemaker code tells the
A) programmability of the pacemaker. B) chamber sensed. C) pacemaker's response to sensed events. D) chamber paced.
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