Heart block is the failure of stimulation of the ventricles following atrial contraction. Which ...

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Heart block is the failure of stimulation of the ventricles following atrial contraction. Which one of the following heart structures could not be involved in heart block?
(a) Atrioventricular node
(b) Bundle of His fibres
(c) Purkinje fibres
(d) Sinoatrial node
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