Systole of heart is initiated by

SA node

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AV node

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Purkinje fibers

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None of the above

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Solution

The correct option is A SA node
The heart beat originates in modified cardiac muscles called sinoatrial node (SA node), which lies in the wall of right atrium near the opening of vena cava. The wave of contraction or cardiac impulse generated by SA node is conducted by cardiac muscle fibres to both the atria causing their contraction (atrial systole).
So, the correct answer is option A.

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The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is
$\begin{matrix} (a) & S A N o d e & A V N o d e & P u r k i n j e f i b e r & A V B u n d l e (b) & S A N o d e & P u r k i n j e f i b e r & A V N o d e & A V B u n d l e (c) & S A N o d e & A V N o d e & A V B u n d l e & P u r k i n j e f i b e r (d) & S A N o d e & P u r k i n j e f i b e r & A V B u n d l e & A V N o d e \end{matrix}$

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