The correct option is (1) SA node has the highest rate of depolarisation.
This is because – Because its autoexcitable tissue generates heart impulses at the fastest rate, the SA node works as a pacemaker for the heart (frequency).
All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?
(1) SA node has the highest rate of depolarisation.
(2) SA node has the lowest rate of depolarisation.
(3) SA node is the only component to generate the threshold potential.
(4) Only SA node can convey the action potential to the other components.
(1) SA node has the highest rate of depolarisation.
(2) SA node has the lowest rate of depolarisation.
(3) SA node is the only component to generate the threshold potential.
(4) Only SA node can convey the action potential to the other components.
All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?
(1) SA node has the highest rate of depolarisation.
(2) SA node has the lowest rate of depolarisation.
(3) SA node is the only component to generate the threshold potential.
(4) Only SA node can convey the action potential to the other components.
(1) SA node has the highest rate of depolarisation.
(2) SA node has the lowest rate of depolarisation.
(3) SA node is the only component to generate the threshold potential.
(4) Only SA node can convey the action potential to the other components.