What happens when pacemaker is non-functional? | CGP Edu

Biology Body Fluids and Circulation Circulatory Pathways and Human Circulatory System Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

What happens when pacemaker is non-functional?

A

Only the auricle will contract rhythmically

B

The cardiac muscles do not contract in a coordinated manner rhythmically

C

Only ventricles will contract rhythmically

D

Cardiac muscles will contract in a coordinated manner

Text Solution

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The correct answer is:

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SA- node is known as the natural pacemaker of heart. It is responsible for initiation of heart beat which is then passed through Bundle of His and Purkinje fibres to reach all parts of the heart. Thus, if it becomes non functional, there is irregularity in heart rhythm and creating failure of the atrial impulses received by ventricle.

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