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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