If the pacemaker is absent,what will happen?

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(D) The pacemaker,specifically the $SA$ node,is responsible for initiating and regulating the rhythmic contraction of the heart. It generates electric

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Cardiac muscles will not contract in a coordinated manner

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(D) The pacemaker,specifically the $SA$ node,is responsible for initiating and regulating the rhythmic contraction of the heart. It generates electrical impulses that spread across the heart,ensuring that the cardiac muscles contract in a coordinated and sequential manner. If the pacemaker is absent or non-functional,the heart loses its ability to initiate these rhythmic impulses,and consequently,the cardiac muscles will not contract in a coordinated manner.

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