All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?

1. SA node has the lowest rate of depolarisation
2.  SA node is the only component to generate the threshold potential.
3. Only SA node can convey the action potential to the other
4. SA node has the highest rate of depolarisation.

Subtopic:  Human Heart: Gross Anatomy |
NEET - 2019
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NEET 2023 - Target Batch - Aryan Raj Singh
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