Why do atrial myocytes have a shorter AP duration vs ventricular myocytes?

Why do atrial myocytes have a shorter AP duration vs ventricular myocytes?

Atrial myocytes express Kur and increased Ikr and Iks which has the overall effect of shorting the AP duration in atrial myocytes. What is the overall purpose/effect of having shorted AP duration in atrial myocytes?

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