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

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

Solution & Step-by-step Explanation

ShutterstockThe Sino-Atrial (SA) node acts as the pacemaker because it generates the maximum number of action potentials (highest frequency of firing or rate of depolarisation) per minute compared to other nodal tissues like the AV node or Purkinje fibers.

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All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?
A
SA node has the lowest rate of depolarisation
B
SA node is the only component to generate the threshold potential.
C
Only SA node can convey the action potential to the other
D
SA node has the highest rate of depolarisation.

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