Question

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

विकल्प

• S A Node, A V Node, Purkinje fiber, A V Bundle

• S A Node, Purkinje fiber, A V Node, A V Bundle

• S A Node, A V Node, A V Bundle, Purkinje fiber

• S A Node, Purkinje fiber, A V Bundle, A V Node

Answer 1

The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is S A Node, A V Node, A V Bundle, Purkinje fiber.

Explanation:

SA node is situated in the walls of the right auricle near the opening of the superior vena cava. In the myogenic heart, the contraction is initiated by SA node. The wave of contraction reaches AV node from SA node. From AV node, the contraction wave reaches the AV bundle and through purkinje fibres, it spreads to the wall of ventricles.