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 muscles will contract in a coordinated manner
Correct Answer: B
Solution :
[b] In a case, when SA-node or the pacemaker becomes non-functional, then there will be no origin of heartbeat and will be no transmission of impulses of atria. Also, the ventricles will fail to receive atrial impulse by obstruction in AV conduction. Thus, overall conducting system of heart is disrupted. Hence, the complete cardiac muscles fail to contract rhythmically in a well-coordinated manner.
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