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Which of the following is a feature of the action potential in the pacemaker cel...

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Which of the following is a feature of the action potential in the pacemaker cells of the SA node?

A repolarization phase caused by K⁺ influx.

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A slow depolarization during the resting phase between action potentials.

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A sustained depolarization or ‘plateau’ phase caused by Ca²⁺ influx.

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A rapid depolarization phase caused by Na⁺ influx.

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A resting membrane potential averaging -85 V.

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