Which structure generates an action potential | vedclass

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(A) The $SA$ node (Sinoatrial node) is known as the pacemaker of the heart. It is a specialized patch of cardiac muscle fibers located in the right at

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$SA$ node

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(A) The $SA$ node (Sinoatrial node) is known as the pacemaker of the heart. It is a specialized patch of cardiac muscle fibers located in the right atrium that possesses the property of self-excitation. It generates an action potential spontaneously without any external neural or hormonal stimulus,which initiates the heartbeat.

Which structure generates an action potential without any external stimulus?

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