Biology · PYQ NEET UG 2019(2)

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

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