Which of the following is the MOST common way that medications exert their actions?

a. Receptor site binding.
b. Changing the physical properties of a cell.
c. Chemically combining with another chemical.
d. Altering the normal metabolic pathway.

a
Rationale: a. Correct.
b. While all answers listed are ways in which a drug may exert its actions, receptor site binding is the most common.
c. While all answers listed are ways in which a drug may exert its actions, receptor site binding is the most common.
d. While all answers listed are ways in which a drug may exert its actions, receptor site binding is the most common.