What happens when the pacemaker is non functional?

Only the auricles will contract rhythmically

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The cardiac muscles do not contract in a coordinated manner rhythmically.

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Only ventricles contract rhythmically.

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Cardiac muscles will contract in a coordinated manner.

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Solution

The correct option is B The cardiac muscles do not contract in a coordinated manner rhythmically.
In case, when SA node or the pacemaker is non-functional then there will be no origin of heart beat and there will be no transmission of impulses to atria. The ventricle fails to receive atrial impulse due to an obstruction in AV conduction. Thus, overall conducting of heart system is disrupted.

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