Purkinje fibers have an intrinsic beat rate of approximately?

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Multiple Choice

Purkinje fibers have an intrinsic beat rate of approximately?

Explanation:
Purkinje fibers act as the heart’s backup pacemaker and fire far more slowly than the main pacing sites. Their intrinsic automaticity is in the low end of the range, about 15 to 40 beats per minute. In a healthy heart, the sinoatrial node sets the pace at 60–100 BPM; if that fails, the AV node can pace at roughly 40–60 BPM. Only if both of those fail do the Purkinje fibers take over, producing a very slow escape rhythm. That’s why the intrinsic beat rate associated with Purkinje fibers is around 15–40 BPM.

Purkinje fibers act as the heart’s backup pacemaker and fire far more slowly than the main pacing sites. Their intrinsic automaticity is in the low end of the range, about 15 to 40 beats per minute. In a healthy heart, the sinoatrial node sets the pace at 60–100 BPM; if that fails, the AV node can pace at roughly 40–60 BPM. Only if both of those fail do the Purkinje fibers take over, producing a very slow escape rhythm. That’s why the intrinsic beat rate associated with Purkinje fibers is around 15–40 BPM.

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