A) Chordae tendineae
B) Sinoatrial node
C) Purkinje fibres
D) Atrioventricular node
Correct Answer: B
Solution :SA is the site of generation of the rhythmic cardiac impulse. AV node is a compact mass of myogenic fibres which receives impulse from SA node and transmits it to the ventricles. Purkinje fibres are in contact with the contractile muscles of the ventricular walls, chordae tendineae are the muscles which keep the AV valves in position. Hence, the correct option is [b].
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