A reduction in blood pressure with antihypertensives is an example of which type of response?

A reduction in blood pressure with antihypertensives is an example of which type of response?

• A. Graded
• B. Quantal
• C. No response
• D. Threshold-based

Answer: (A)

This item tests the distinction between graded and quantal dose–response relationships. A reduction in blood pressure from antihypertensives is a continuous, dose‑dependent change in magnitude within an individual, measured in units like mmHg. As you adjust the dose, the amount of lowering changes smoothly, not just turning on or off. That continuous, quantitative nature is what defines a graded response. Quantal responses, by contrast, classify each subject as a responder or nonresponder at a given dose and describe the fraction of responders across a population. So the blood pressure decrease fits a graded response because it’s a measurable, dose‑dependent magnitude rather than an all‑or‑none outcome.

This item tests the distinction between graded and quantal dose–response relationships. A reduction in blood pressure from antihypertensives is a continuous, dose‑dependent change in magnitude within an individual, measured in units like mmHg. As you adjust the dose, the amount of lowering changes smoothly, not just turning on or off. That continuous, quantitative nature is what defines a graded response. Quantal responses, by contrast, classify each subject as a responder or nonresponder at a given dose and describe the fraction of responders across a population. So the blood pressure decrease fits a graded response because it’s a measurable, dose‑dependent magnitude rather than an all‑or‑none outcome.