Multiple choice

Cardiac impulse is produced by SA node and impulse is transmitted to the AV node, from which it passed through bundle of His and then reaches Purkinje fibre. Cardiac impulse is transmitted from SA node to AV node through

  1. internodal fibre

  2. interzonal fibre

  3. purkinje fibre

  4. elastin fibre

  5. collagen fibre

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A Correct answer
Explanation

It carries cardiac impulse produced in SA node to AV node. Hence, it initiates systole in ventricles.