Electrophysiologists Conduct a Study in Which They Record the Membrane

question 98

Multiple Choice

Electrophysiologists conduct a study in which they record the membrane potential changes of cardiac cells while exposing them to various agents.  A tracing from one of the experiments is shown below. Which of the following substances was most likely applied to the cells at the point indicated by the arrow?

• A)Adenosine
• B)Aldosterone
• C)Angiotensin II
• D)Glucagon
• E)Glycine
• F)Norepinephrine

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Definitions:

Cyclohexanone

An organic compound characterized by a six-membered cyclic structure containing one ketone group, used as a solvent and in the synthesis of various chemicals.

Cation

A positively charged ion that is created when an atom loses one or more electrons, resulting in more protons than electrons.

Propensity

A natural inclination or tendency to behave in a particular way.

Hydrate

A compound that contains water molecules bound to another compound or within its crystal structure.