18. The Heart

Cardiac Action Potentials

Anatomy & Physiology18. The HeartCardiac Action Potentials

Multiple Choice

How would you expect the absolute refractory period of a contractile cell to change if more potassium channels opened sooner after polarization?

Absolute refractory period would increase.

Absolute refractory period would decrease.

There would be no change; absolute refractory period is determined by the calcium ion channels.

It’s impossible to tell as opening potassium channels will have an unpredictable effect on sodium channels.

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How would you expect the absolute refractory period of a contractile cell to change if more potassium channels opened sooner after polarization?