A Patient with a Hypertensive Emergency Is Given an Intravenous

question 3

Multiple Choice

A patient with a hypertensive emergency is given an intravenous infusion of a drug that dilates renal afferent and efferent arterioles and is rapidly metabolized with a half-life of 5 minutes. Which mechanism is responsible for the therapeutic effect of this drug?

• A) activation of dopamine D1 receptors
• B) activation of dopamine D2 receptors
• C) blockade of α 1-adrenoceptors
• D) activation of α 2-adrenoceptors
• E) blockade of α 1- and β
• 1-adrenoceptors

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Definitions:

Perforation Plates

Structures found in the water-conducting vessels of some plants, containing large pores that allow water to flow from one vessel element to another.

Sieve Plates

Specialized structures found in the phloem of plants that facilitate the flow of nutrients by containing pores through which sap can flow between cells.

Vascular Cylinder

Of a plant root, central column that consists of vascular tissue, pericycle, and supporting cells.

Endodermal Cells

Cells originating from the innermost layer of the embryo, which give rise to the lining of the digestive and respiratory systems.