Sino-atrial node is called the pacemaker of our heart. Why? - Vidyadip

Question

Sino-atrial node is called the pacemaker of our heart. Why?

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Answer

The sino-atrial node generates the action potential and produces the cardiac impulse.
This cardiac impulse then spreads over atria and ventricles causing them to contract or relax.
The SA node can generate a maximum number of action potentials which is about 70−75 per minute.
It also controls the rhythmic contractile activity of the heart.
Because of the property of originating a cardiac impulse, the sino-atrial node is called the pacemaker of the heart.

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