Q. What happens when the pacemaker is non-functional?

A) Only the auricles will contract rhythmically
B) The cardiac muscles do not contract in a coordinated manner rhythmically
C) Only ventricles will contract rhythmically
D) Cardiac muscle will contract in a coordinated manner
Explanation

In case, when SA-node or the pacemaker is non-functional then, there will no origin of heart beat and there will no transmission of impulses to atria. The ventricle fails to receive atrial impulse by obstruction in AV conduction. Thus, overall conducting system of heart is disrupted.

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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