Which of the following statements about action potentials in the heart is correct? A) The rising phase of the action potential in autorhythmic cells is due to a rapid Ca²⁺ influx. B) The rising phase of the action potential in contractile cells is due to a rapid Na⁺ influx. C) The plateau phase of the action potential in contractile cells is due to a slow Ca²⁺ influx. D) The rising phase of the action potential in autorhythmic cells is due to a rapid Ca²⁺ influx, and the rising phase of the action potential in contractile cells is due to a rapid Na⁺ influx E) all of these

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Quizplus · Accepted Answer

The rising phase of the action potential in autorhythmic cells is due to a rapid Ca²⁺ influx, and the rising phase of the action potential in contractile cells is due to a rapid Na⁺ influx. The plateau phase of the action potential in contractile cells is due to a slow Ca²⁺ influx.

Which of the Following Statements About Action Potentials in the Heart