The pacemaker of the human heart is the
Correct answer: C. sinoatrial node in the wall of the right atrium
- A. atrioventricular node
- B. bundle of His
- C. sinoatrial node in the wall of the right atrium
- D. network of Purkinje fibres
Explanation
The sinoatrial node depolarises spontaneously about seventy times a minute and sets the rhythm, which is why the heartbeat is myogenic and a heart continues beating when removed from the body. The atrioventricular node can also fire on its own but at a slower rate, so it takes over only if the sinoatrial node fails. The bundle of His and the Purkinje fibres conduct the impulse rather than generate it.
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About Cardiac Cycle and Heartbeat
The cardiac cycle describes atrial systole, ventricular systole and diastole, including pressure changes, blood movement and the opening or closing of heart valves. It also covers the conduction pathway from the sinoatrial node through the atrioventricular node, bundle of His and Purkinje fibres, and relates these events to heartbeat sounds.
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