In a Research, Electrophysiologists Expose Cardiac Cells to Various Substances

In a research, electrophysiologists expose cardiac cells to various substances and record how the membrane potential of the cells changes. Below is a trace from one of the tests. 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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