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SA node?
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No t tubule

Sinus arrhythmia is produced by?
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SA node

Slow depolarizing pre potentials are characteristic of?
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SA node

SA node is pacemaker because its excitability is?
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Highest of all

SA node acts as pacemaker because?
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Blood supply to SA node?
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Right posterior interventricular artery

Initial depolarization is due to?
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Rapid Na+ influx

Plateau phase is due to?
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Slow Na+ influx

Repolarization is due to?
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K+ efflux

Refractory period is NOT affected by?
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Sympathetic stimulation
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