Ncert Exercises & Solutions

The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is

SA Node

AV Node

Purkinje fiber

AV Node

Purkinje fiber

AV Node

AV Bundle

Purkinje fiber

AV Node

(c) SA Node It is situated in the walls of the right auricle near the opening of the superior vena cava. In myogenic heart the contraction is initiated by SA node.

AV Node The wave of contraction reaches AV node which is stimulated to emit an impulse of contraction spreading to the ventricular muscle via the atrio ventricular bundle and thento the Purkinje fibres stimulating heart beat.

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