Pharmacology Pharmacodynamics

Question 1

What is the primary function of a drug receptor in pharmacodynamics?

Accepted Answer

To bind to the drug and mediate its effects

Answer

To metabolize the drug

Answer

To excrete the drug from the body

Answer

To transport the drug through the bloodstream

Question 2

An agonist is a substance that:

Accepted Answer

Activates a receptor to produce a biological response

Answer

Blocks the effect of a receptor

Answer

Competes with other drugs for metabolism

Answer

Binds irreversibly to enzymes

Question 3

Which of the following best describes the therapeutic index (TI) of a drug?

Accepted Answer

The ratio of the toxic dose to the effective dose

Answer

The dose required to produce the desired effect in 50% of the population

Answer

The range between the minimum effective concentration and the toxic concentration

Answer

The time required for the drug's effect to be observed

Question 4

Which term describes the maximum effect that a drug can produce, regardless of dose?

Accepted Answer

Efficacy

Answer

Potency

Answer

Selectivity

Answer

Affinity

Question 5

If a drug binds to a receptor but does not activate it and instead prevents other substances from binding, it is classified as:

Accepted Answer

An antagonist

Answer

An agonist

Answer

A partial agonist

Answer

A synergist