NEET Biology question

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 rhythmicallyCorrect
(C)Only ventricles will contract rhythmically
(D)Cardiac muscle will contract in a coordinated manner

Answer: (B)

Solution

If the SA-node fails, the heart loses its single coordinating source of rhythmic stimulation, so the

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Question ID VK-115960