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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. |
Other Reason
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