In an Experiment Investigating Vasoconstriction of the Arterial Wall, Two

question 232

Multiple Choice

In an experiment investigating vasoconstriction of the arterial wall, two samples of isolated porcine arterial vessels are studied.  Vascular tone is measured in the control vessel during infusion of increasing doses of norepinephrine.  The other vessel is pretreated with experimental drug A prior to infusion of norepinephrine.  A graph of the study results is depicted below. Drug A is most similar to which of the following agents?

• A)Atropine
• B)Labetalol
• C)Phenoxybenzamine
• D)Phentolamine
• E)Propranolol

---

Definitions:

Sedimentation

The process by which material is deposited by wind, water, or ice, often resulting in layers of sediment that can eventually form sedimentary rocks.

Stream Channel

A stream channel is the physical confinement of a river or stream, composed of a bed and banks, which directs the flow of water.

Theory of Reasoned Action

A theory that predicts individuals' behavioral intentions and actions based on their attitudes toward the behavior and subjective norms.

Theory of Planned Behavior

A psychological theory that links beliefs and behavior, stating that individual behavior is driven by behavioral intentions where attitudes, subjective norms, and perceived control play significant roles.