Which structure acts as the primary pacemaker of the human heart?
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Correct answer: Sinoatrial (SA) node
The sinoatrial (SA) node initiates electrical impulses that set the basic rhythm of the heart. It has the highest intrinsic rate of spontaneous depolarisation among all cardiac tissues, so it functions as the primary pacemaker.
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More Cardiac Conduction System (SA, AV Nodes) questions
- The SA node is located in which part of the heart?
- Which node receives impulses from the SA node and delays them before ventricular contraction?
- The main functional significance of AV nodal delay is to:
- Which part of the conduction system connects the AV node to ventricular myocardium?
- Purkinje fibers primarily function to:
- If the SA node fails, which structure can take over as pacemaker at a slower rate?