Question

What occurs when a drug binds to a receptor in the body? A. It alters the...

What occurs when a drug binds to a receptor in the body?
A. It alters the receptor to become nonresponsive to its usual endogenous molecules.
B. It gives the receptor a new function.
C. It prevents the action of the receptor by altering its response to chemical mediators.
D. It increases or decreases the activity of that receptor.
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Answer #1

Ans) D. It increases or decreases the activity of that receptor.

Explaination:

When a drug binds to a receptor in the body it increases or decreases the activity of that receptor.

- As binding to the active site on the receptor regulates receptor activation directly.

- The activity of receptors can also be regulated by the binding of a ligand to other sites on the receptor, as in allosteric binding sites.

- Antagonists mediate their effects through receptor interactions by preventing agonist-induced responses.

- This may be accomplished by binding to the active site or the allosteric site.

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