MCQ
Drugs which supplement $($or$)$ substitute for chemical messengers are:
  • A
    Antagonists
  • Agonists
  • C
    Blocking chemicals
  • D
    All

Answer

Correct option: B.
Agonists
An agonist is a chemical that binds to some receptor of a cell and triggers a response by that cell.
Agonists often mimic the action of a naturally occurring substance.
Whereas an agonist causes an action, an antagonist blocks the action of the agonist and an inverse agonist causes an action opposite to that of the agonist.
So agonist drugs copy the action of the chemical messengers thereby substituting them.

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