A certain medication binds with serotonin receptors but does not affect neurons in the same way as serotonin does. Which of the following statements about the medication is true?
A) It must be an agonist.
B) It must be an antagonist.
C) It could be either an agonist or a neuromodulator, but it cannot be an antagonist.
D) It could be either an agonist or an antagonist, but it cannot be an neuromodulator.

Question

Quizplus · Accepted Answer

A medication that binds to a receptor but does not activate it in the same way as its endogenous ligand (in this case, serotonin) is classified as an antagonist. Agonists activate the receptor in the same way as the endogenous ligand, while neuromodulators alter the activity of neurons without directly binding to receptors. Therefore, option B is the best choice.

A Certain Medication Binds with Serotonin Receptors but Does Not