The intrinsic rhythmicity of the heart is due to:
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Correct answer: Myogenic activity of nodal tissue
The heart shows myogenic rhythm due to specialised nodal tissue — primarily the SA node — that can generate impulses independently of any nervous input. Autonomic nerves only modulate the rate.
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More Cardiac Conduction System (SA, AV Nodes) questions
- Which cardiac tissue has the highest rate of spontaneous depolarization?
- The AV node is located at the junction of:
- Which structure ensures that impulses reach the apex of the heart first?
- Bundle branches are located in the:
- Which event occurs first in the normal cardiac conduction sequence?
- Damage to the AV node would most directly affect: