Which statement best describes the tissue level of drug action?

Which statement best describes the tissue level of drug action?

• A. an effect on tissue function
• B. Change in organ size
• C. Molecular binding
• D. System-wide regulation

Answer: (A)

The tissue level of drug action is about how the drug changes how a tissue operates. This means a functional change within the tissue itself—for example, altering how a tissue contracts, secretes substances, or transports ions. It’s not primarily about altering the tissue’s size, which is a structural change, nor about the initial molecular binding to a target, which sits at a more basic level of interaction. It also isn’t a broad, system-wide effect that involves many tissues across the body. So an effect on tissue function best describes the tissue level of drug action.

The tissue level of drug action is about how the drug changes how a tissue operates. This means a functional change within the tissue itself—for example, altering how a tissue contracts, secretes substances, or transports ions. It’s not primarily about altering the tissue’s size, which is a structural change, nor about the initial molecular binding to a target, which sits at a more basic level of interaction. It also isn’t a broad, system-wide effect that involves many tissues across the body. So an effect on tissue function best describes the tissue level of drug action.