Multiple choice

How do the waves travel from SA node to ventricles?

  1. SA node - Purkinje fibres - Bundle of His - AV node - Ventricles

  2. SA node - Bundle of His - Purkinje fibres - AV node - Ventricles

  3. SA node - A.V. node - Bundle of His - Purkinje fibres - Ventricles

  4. SA node - AV node - Purkinje fibrres - Ventricles
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C Correct answer
Explanation

AV node picks up the wave of contraction propagated by SA node. The waves then pass through the Bundle of His, which passes down the intraventricular septum and divides into two branches, one of which is distributed to each ventricle through a fine network of Purkinje fibres. In this way, wave of contraction travels up to the ventricles.

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