Electrophysiologists Conduct a Study in Which They Record the Membrane

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

Correct Answer:

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